Philosophy of biology
Encyclopedia
The philosophy of biology is a subfield of philosophy of science
Philosophy of science
The philosophy of science is concerned with the assumptions, foundations, methods and implications of science. It is also concerned with the use and merit of science and sometimes overlaps metaphysics and epistemology by exploring whether scientific results are actually a study of truth...

, which deals with epistemological, metaphysical
Metaphysics
Metaphysics is a branch of philosophy concerned with explaining the fundamental nature of being and the world, although the term is not easily defined. Traditionally, metaphysics attempts to answer two basic questions in the broadest possible terms:...

, and ethical
Ethics
Ethics, also known as moral philosophy, is a branch of philosophy that addresses questions about morality—that is, concepts such as good and evil, right and wrong, virtue and vice, justice and crime, etc.Major branches of ethics include:...

 issues in the biological and biomedical sciences. Although philosophers of science and philosophers generally have long been interested in biology (e.g., Aristotle
Aristotle
Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

, Descartes
René Descartes
René Descartes ; was a French philosopher and writer who spent most of his adult life in the Dutch Republic. He has been dubbed the 'Father of Modern Philosophy', and much subsequent Western philosophy is a response to his writings, which are studied closely to this day...

, and even Kant
Immanuel Kant
Immanuel Kant was a German philosopher from Königsberg , researching, lecturing and writing on philosophy and anthropology at the end of the 18th Century Enlightenment....

), philosophy of biology only emerged as an independent field of philosophy in the 1960s and 1970s. Philosophers of science then began paying increasing attention to biology
Biology
Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy. Biology is a vast subject containing many subdivisions, topics, and disciplines...

, from the rise of Neodarwinism in the 1930s and 1940s to the discovery of the structure of DNA
DNA
Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...

 in 1953 to more recent advances in genetic engineering
Genetic engineering
Genetic engineering, also called genetic modification, is the direct human manipulation of an organism's genome using modern DNA technology. It involves the introduction of foreign DNA or synthetic genes into the organism of interest...

.
Other key ideas include the reduction
Reduction (philosophy)
In philosophy, reduction is the process by which one object, property, concept, theory, etc., is shown to be explicable in terms of another, lower level, entity...

 of all life processes to biochemical reactions, and the incorporation of psychology
Psychology
Psychology is the study of the mind and behavior. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases. For many, the ultimate goal of psychology is to benefit society...

 into a broader neuroscience
Neuroscience
Neuroscience is the scientific study of the nervous system. Traditionally, neuroscience has been seen as a branch of biology. However, it is currently an interdisciplinary science that collaborates with other fields such as chemistry, computer science, engineering, linguistics, mathematics,...

.

Overview

Philosophy of biology today has become a very visible, well-organized discipline - with its own journals, conferences, and professional organizations. The largest of the latter is the International Society for the History, Philosophy, and Social Studies of Biology (ISHPSSB); the name of the Society reflecting the interdisciplinary nature of the field.
The philosophy of biology can be seen as following an empirical
Empiricism
Empiricism is a theory of knowledge that asserts that knowledge comes only or primarily via sensory experience. One of several views of epistemology, the study of human knowledge, along with rationalism, idealism and historicism, empiricism emphasizes the role of experience and evidence,...

 tradition, favoring naturalism.
Many contemporary philosophers of biology have largely avoided traditional questions about the distinction between life
Life
Life is a characteristic that distinguishes objects that have signaling and self-sustaining processes from those that do not, either because such functions have ceased , or else because they lack such functions and are classified as inanimate...

 and non-life. Instead, they have examined the practices, theories, and concepts of biologists with a view toward better understanding biology as a scientific discipline (or group of scientific fields).
Scientific ideas are philosophically analyzed and their consequences are explored. It is sometimes difficult to delineate philosophy of biology as separate from theoretical biology. A few of the questions philosophers of biology have attempted to answer, for example, include:
  • "What is a biological species
    Species
    In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

    ?"
  • "How is rationality possible, given our biological origins?"
  • "How do organisms coordinate their common behavior?"
  • "Are there genome editing agents?"
  • "How might our biological understandings of race, sexuality, and gender
    Gender
    Gender is a range of characteristics used to distinguish between males and females, particularly in the cases of men and women and the masculine and feminine attributes assigned to them. Depending on the context, the discriminating characteristics vary from sex to social role to gender identity...

     reflect social values?"
  • "What is natural selection, and how does it operate in nature?"
  • "How do medical doctors explain disease
    Disease
    A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune...

    ?"
  • "From where do language
    Language
    Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication...

     and logic
    Logic
    In philosophy, Logic is the formal systematic study of the principles of valid inference and correct reasoning. Logic is used in most intellectual activities, but is studied primarily in the disciplines of philosophy, mathematics, semantics, and computer science...

     stem?";
  • "How is ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...

     related to medicine
    Medicine
    Medicine is the science and art of healing. It encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness....

    ?"
  • "What is the material basis of consciousness
    Consciousness
    Consciousness is a term that refers to the relationship between the mind and the world with which it interacts. It has been defined as: subjectivity, awareness, the ability to experience or to feel, wakefulness, having a sense of selfhood, and the executive control system of the mind...

    ?"


A subset of philosophers of biology with a more explicitly naturalistic orientation hope that biology will provide scientific answers to such fundamental problems of epistemology, ethics
Ethics
Ethics, also known as moral philosophy, is a branch of philosophy that addresses questions about morality—that is, concepts such as good and evil, right and wrong, virtue and vice, justice and crime, etc.Major branches of ethics include:...

, aesthetics
Aesthetics
Aesthetics is a branch of philosophy dealing with the nature of beauty, art, and taste, and with the creation and appreciation of beauty. It is more scientifically defined as the study of sensory or sensori-emotional values, sometimes called judgments of sentiment and taste...

, anthropology
Anthropology
Anthropology is the study of humanity. It has origins in the humanities, the natural sciences, and the social sciences. The term "anthropology" is from the Greek anthrōpos , "man", understood to mean mankind or humanity, and -logia , "discourse" or "study", and was first used in 1501 by German...

 and even metaphysics
Metaphysics
Metaphysics is a branch of philosophy concerned with explaining the fundamental nature of being and the world, although the term is not easily defined. Traditionally, metaphysics attempts to answer two basic questions in the broadest possible terms:...

.
Furthermore, progress in biology urges modern societies to rethink traditional values concerning all aspects of human
Human
Humans are the only living species in the Homo genus...

 life
Life
Life is a characteristic that distinguishes objects that have signaling and self-sustaining processes from those that do not, either because such functions have ceased , or else because they lack such functions and are classified as inanimate...

. The possibility of genetic
Genetics
Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

 modification of human stem cells, for example, has led to an ongoing controversy on how certain biological techniques could infringe upon ethical consensus (see bioethics
Bioethics
Bioethics is the study of controversial ethics brought about by advances in biology and medicine. Bioethicists are concerned with the ethical questions that arise in the relationships among life sciences, biotechnology, medicine, politics, law, and philosophy....

).
Some of the questions addressed by these philosophers of biology include:
  • "What is life?"
  • "What makes humans uniquely human?";
  • "What is the basis of moral thinking?";
  • "What are the factors we use for aesthetic
    Aesthetics
    Aesthetics is a branch of philosophy dealing with the nature of beauty, art, and taste, and with the creation and appreciation of beauty. It is more scientifically defined as the study of sensory or sensori-emotional values, sometimes called judgments of sentiment and taste...

     judgments?";
  • "Is evolution compatible with Christianity
    Christianity
    Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...

     or other religious
    Religion
    Religion is a collection of cultural systems, belief systems, and worldviews that establishes symbols that relate humanity to spirituality and, sometimes, to moral values. Many religions have narratives, symbols, traditions and sacred histories that are intended to give meaning to life or to...

     systems?"


Increasingly, ideas drawn from philosophical ontology
Ontology
Ontology is the philosophical study of the nature of being, existence or reality as such, as well as the basic categories of being and their relations...

 and logic are being used by biologists in the domain of bioinformatics
Bioinformatics
Bioinformatics is the application of computer science and information technology to the field of biology and medicine. Bioinformatics deals with algorithms, databases and information systems, web technologies, artificial intelligence and soft computing, information and computation theory, software...

. Ontologies such as the Gene Ontology are being used to annotate the results of biological experiments in a variety of model organisms in order to create logically tractable bodies of data available for reasoning and search. The Gene Ontology itself is a species-neutral graph-theoretical representation of biological types joined together by formally defined relations.

Reductionism, holism, and vitalism

One subject within philosophy of biology deals with the relationship between reductionism and holism, contending views with epistemological and methodological significance, but also with ethical and metaphysical connotations.
  • Scientific reductionism is the view that higher-level biological processes reduce to physical and chemical processes. For example, the biological process of respiration is explained as a biochemical process involving oxygen and carbon dioxide.
  • Holism
    Holism
    Holism is the idea that all the properties of a given system cannot be determined or explained by its component parts alone...

     is the view that emphasizes higher-level processes, also called emergent
    Emergent
    It may also mean:* Emergent , Neural Simulation Software* Emergent , a 2003 album by Gordian Knot* emergent plant, a plant which grows in water but which pierces the surface so that it is partially in air...

     properties: phenomena at a larger level that occur due to the pattern of interactions between the elements of a system over time. For example, to explain why one species of finch survives a drought while others die out, the holistic method looks at the entire ecosystem. Reducing an ecosystem to its parts in this case would be less effective at explaining overall behavior (in this case, the decrease in biodiversity). See also Holism in science
    Holism in science
    Holism in science, or Holistic science, is an approach to research that emphasizes the study of complex systems. This practice is in contrast to a purely analytic tradition which aims to gain understanding of systems by dividing them into smaller composing elements and gaining understanding of the...

    .
  • Vitalism
    Vitalism
    Vitalism, as defined by the Merriam-Webster dictionary, is#a doctrine that the functions of a living organism are due to a vital principle distinct from biochemical reactions...

     is the view, rejected by mainstream biologists since the 19th century, that there is a life-force
    Odic force
    The Odic force is the name given in the mid-19th century to a hypothetical vital energy or life force by Baron Carl von Reichenbach...

     (called the "vis viva") that has thus far been unmeasurable scientifically that gives living organisms their "life." Vitalists often claimed that the vis viva acts with purposes according to its pre-established "form" (see teleology
    Teleology
    A teleology is any philosophical account which holds that final causes exist in nature, meaning that design and purpose analogous to that found in human actions are inherent also in the rest of nature. The word comes from the Greek τέλος, telos; root: τελε-, "end, purpose...

    ). Examples of vitalist philosophy are found in many religions. Mainstream biologists reject vitalism on the grounds that it opposes the scientific method
    Scientific method
    Scientific method refers to a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry must be based on gathering empirical and measurable evidence subject to specific principles of...

    . The scientific method was designed as a methodology to build an extremely reliable understanding of the world, that is, a supportable, evidence
    Evidence
    Evidence in its broadest sense includes everything that is used to determine or demonstrate the truth of an assertion. Giving or procuring evidence is the process of using those things that are either presumed to be true, or were themselves proven via evidence, to demonstrate an assertion's truth...

    d understanding. Following this epistemological view, mainstream scientists reject phenomena that have not been scientifically measured or verified, and thus reject vitalism.


Some philosophers of biology have attempted to explain the rise and fall of reductionism, vitalism, and holism throughout the history of biology. For example, these philosophers claim that the ideas of Charles Darwin
Charles Darwin
Charles Robert Darwin FRS was an English naturalist. He established that all species of life have descended over time from common ancestry, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection.He published his theory...

 ended the last remainders of teleological views from biology. Debates in these areas of philosophy of biology turn on how one views reductionism.

An autonomous philosophy of biology

All processes in organisms obey physical laws, the difference from inanimate processes lying in their organisation and their being subject to control by coded information. This has led some biologists and philosophers (for example, Ernst Mayr
Ernst Mayr
Ernst Walter Mayr was one of the 20th century's leading evolutionary biologists. He was also a renowned taxonomist, tropical explorer, ornithologist, historian of science, and naturalist...

 and David Hull
David Hull
David Lee Hull was a philosopher with a particular interest in the philosophy of biology. In addition to his academic prominence, he was well-known as a gay man who fought for the rights of other gay and lesbian philosophers....

) to return to the strictly philosophical reflections of Charles Darwin
Charles Darwin
Charles Robert Darwin FRS was an English naturalist. He established that all species of life have descended over time from common ancestry, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection.He published his theory...

 to resolve some of the problems which confronted them when they tried to employ a philosophy of science derived from classical physics
Classical physics
What "classical physics" refers to depends on the context. When discussing special relativity, it refers to the Newtonian physics which preceded relativity, i.e. the branches of physics based on principles developed before the rise of relativity and quantum mechanics...

. This latter, positivist approach emphasised a strict determinism (as opposed to high probability) and to the discovery of universally applicable laws, testable in the course of experiment. It was difficult for biology, beyond a basic microbiological level, to live up to these structures - Karl Popper
Karl Popper
Sir Karl Raimund Popper, CH FRS FBA was an Austro-British philosopher and a professor at the London School of Economics...

 for example said that "Darwinism is not a testable scientific theory, but a metaphysical research programme." Standard philosophy of science seemed to leave out a lot of what characterised living organisms - namely, a historical component in the form of an inherited genotype.

Biologists with philosophic interests responded, emphasising the dual nature of the living organism. On the one hand there was the genetic programme (represented in nucleic acids) - the genotype
Genotype
The genotype is the genetic makeup of a cell, an organism, or an individual usually with reference to a specific character under consideration...

. On the other there was its extended body or soma - the phenotype
Phenotype
A phenotype is an organism's observable characteristics or traits: such as its morphology, development, biochemical or physiological properties, behavior, and products of behavior...

. In accommodating the more probabilistic and non-universal nature of biological generalisations, it was a help that standard philosophy of science was in the process of accommodating similar aspects of 20th century physics
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...

.

This led to a distinction between proximate causes and explanations - "how" questions dealing with the phenotype; and ultimate causes - "why" questions, including evolutionary causes, focused on the genotype. This clarification was part of the great reconciliation, by Ernst Mayr
Ernst Mayr
Ernst Walter Mayr was one of the 20th century's leading evolutionary biologists. He was also a renowned taxonomist, tropical explorer, ornithologist, historian of science, and naturalist...

, among others, in the 1940s, between Darwinian evolution by natural selection
Natural selection
Natural selection is the nonrandom process by which biologic traits become either more or less common in a population as a function of differential reproduction of their bearers. It is a key mechanism of evolution....

 and the genetic
Genetics
Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

 model of inheritance. A commitment to conceptual clarification has characterised many of these philosophers since. Trivially, this has reminded us of the scientific basis of all biology, while noting its diversity - from microbiology to ecology. A complete philosophy of biology would need to accommodate all these activities. Less trivially, it has unpacked the notion of "teleology
Teleology
A teleology is any philosophical account which holds that final causes exist in nature, meaning that design and purpose analogous to that found in human actions are inherent also in the rest of nature. The word comes from the Greek τέλος, telos; root: τελε-, "end, purpose...

". Since 1859, scientists have had no need for a notion of cosmic teleology - a programme or a law that can explain and predict evolution. Darwin provided that. But teleological explanations (relating to purpose or function) have remained stubbornly useful in biology - from the structural configuration of macromolecules to the study of co-operation in social systems. By clarifying and restricting the use of the term to describe and explain systems controlled strictly scientifically by genetic programmes, or other physical systems, teleological questions can be framed and investigated while remaining committed to the physical nature of all underlying organic processes.

Similar attention has been given to the concepts of natural selection
Natural selection
Natural selection is the nonrandom process by which biologic traits become either more or less common in a population as a function of differential reproduction of their bearers. It is a key mechanism of evolution....

(what is the target of natural selection? - the individual? the environment? the genome? the species?); adaptation
Adaptation
An adaptation in biology is a trait with a current functional role in the life history of an organism that is maintained and evolved by means of natural selection. An adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation....

; diversity and classification; species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 and speciation
Speciation
Speciation is the evolutionary process by which new biological species arise. The biologist Orator F. Cook seems to have been the first to coin the term 'speciation' for the splitting of lineages or 'cladogenesis,' as opposed to 'anagenesis' or 'phyletic evolution' occurring within lineages...

; and macroevolution
Macroevolution
Macroevolution is evolution on a scale of separated gene pools. Macroevolutionary studies focus on change that occurs at or above the level of species, in contrast with microevolution, which refers to smaller evolutionary changes within a species or population.The process of speciation may fall...

.

Just as biology
Biology
Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy. Biology is a vast subject containing many subdivisions, topics, and disciplines...

 has developed as an autonomous discipline in full conversation with the other sciences, there is a great deal of work now being carried on by biologists and philosophers to develop a dedicated philosophy of biological science which, while in full conversation with all other philosophic disciplines, attempts to give answers to the real questions raised by scientific investigations in biology.

Other perspectives

While the overwhelming majority of English-speaking scholars operating under the banner of "philosophy of biology" work within the Anglo-American
English American
English Americans are citizens or residents of the United States whose ancestry originates wholly or partly in England....

 tradition of analytical philosophy, there is a stream of philosophic work in continental philosophy
Continental philosophy
Continental philosophy, in contemporary usage, refers to a set of traditions of 19th and 20th century philosophy from mainland Europe. This sense of the term originated among English-speaking philosophers in the second half of the 20th century, who used it to refer to a range of thinkers and...

 which seeks to deal with issues deriving from biological science. The communication difficulties involved between these two traditions are well known, not helped by differences in language. Gerhard Vollmer
Gerhard Vollmer
Gerhard Vollmer is a German physicist and philosopher. He tries to build bridges between the natural science and the more social or humanistic disciplines. He is perhaps best known for his development of an evolutionary theory of knowledge.-Life:Vollmer studied in Munich, Berlin, Hamburg and...

 is often thought of as a bridge but, despite his education and residence in Germany, he largely works in the Anglo-American tradition, particularly pragmatism
Pragmatism
Pragmatism is a philosophical tradition centered on the linking of practice and theory. It describes a process where theory is extracted from practice, and applied back to practice to form what is called intelligent practice...

, and is famous for his development of Lorenz's
Konrad Lorenz
Konrad Zacharias Lorenz was an Austrian zoologist, ethologist, and ornithologist. He shared the 1973 Nobel Prize with Nikolaas Tinbergen and Karl von Frisch...

 and Quine's
Willard Van Orman Quine
Willard Van Orman Quine was an American philosopher and logician in the analytic tradition...

 idea of evolutionary epistemology
Evolutionary epistemology
Evolutionary epistemology refers to two distinct topics - on the one hand, the biological evolution of cognitive mechanisms in animals and humans, and on the other hand, a theory in that knowledge itself evolves by natural selection....

. On the other hand, one scholar who has attempted to give a more continental account of the philosophy of biology is Hans Jonas
Hans Jonas
Hans Jonas was a German-born philosopher who was, from 1955 to 1976, Alvin Johnson Professor of Philosophy at the New School for Social Research in New York City.Jonas's writings were very influential in different spheres...

. His "The Phenomenon of Life" (New York, 1966) sets out boldly to offer an "existential interpretation
Existentialism
Existentialism is a term applied to a school of 19th- and 20th-century philosophers who, despite profound doctrinal differences, shared the belief that philosophical thinking begins with the human subject—not merely the thinking subject, but the acting, feeling, living human individual...

 of biological facts
", starting with the organism's response to stimulus and ending with man confronting the Universe, and drawing upon a detailed reading of phenomenology. This is unlikely to have much influence on mainstream philosophy of biology, but indicates, as does Vollmer's work, the current powerful influence of biological thought on philosophy. A more engaging account is given by the late Virginia Tech philosopher Marjorie Grene
Marjorie Grene
Marjorie Glicksman Grene was an American philosopher.She wrote both on existentialism and the philosophy of science, especially the philosophy of biology. She taught at the University of California at Davis from 1965 to 1978. From 1988 until her death she was Honorary University Distinguished...

.

See also

Some philosophers of biology

Biologists with an interest in the philosophical aspects of biology

External links

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