In human beings the ability to taste phenylthiourea depends upon the presence of a dominant gene.

(a) Construct diagrams showing

(b) (i) the genotype and phenotype of the parental generation and the F1 generation, and the gametes of the cross between a homozygous taster and a homozygous non-taster; (5marks)

(c) (ii) the genotype and phenotype of the progeny of a cross between two individuals of the F1 type in (i)