A pure breeding doubly homozygous tall pea plant that produces yellow peas was crossed with a pure-breeding doubly homozygous dwarf pea plant that produces green peas.

The tall allele, T, is dominant to the dwarf, t, recessive allele, while the yellow allele, Y, is dominant to the green, y recessive allele. Note also that the 2 genes are on different chromosomes: i.e. independent assortment applies

a.) what are the genotypes and their respective frequencies of the gametes produced by the F1 progeny of the above cross?

b.) Indicate which of the gametes are parental and which are recombinant?

c.) What is the minimum number of meioses needed to produce both parental and recombinant gametes?

The F1 plants where then self-crossed as follows, TtYy x TtYy to produce the F2 generation

d.) What are the expected phenotypes and their respective ratios recovered in the F2 generation?

Exam questions from previous years