Using a Punnett Square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

Briefly mention the contribution of T.H. Morgan in genetics.

Define and design a test cross.

39.

When a cross is made between tall plant with yellow seeds (TtYy) and tall plant with green seeds (Ttyy), what proportions of phenotype in the offspring could be expected to be 
(a) tall and green
(b) dwarf and green ?