Answer to Question #244756 in Genetics for Tumzaza

Question

In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:

3.2. homozygous tall wrinkled x short heterozygous smooth.                 [26 marks]

Answer 1

The possible phenotypes are: tall and smooth, tall and wrinkled, short and smooth, short and wrinkled

TtSs and ttss parentals

TtSss x TtSs

Gamety TS/TS/ts/ts X TS/Ts/ts/ts

Phenotypic ratio

3:4:2