You are analyzing inheritance in beans You cross a true bree

You are analyzing inheritance in beans. You cross a true breeding strain with white flowers and purple beans to a strain with red flowers and green beans. All of the progeny have red flowers and green beans. You then allow these plants to self-fertilize to produce the next generation.

A: Which traits are dominant?

B: Assuming these traits are inherited in a simple Mendelian fashion, what would be the expected number of offspring of each type from the self-cross if 200 offsrping were produced in total?

Solution

Answer:

P1: white flowers and purple beans (rrgg) x red flowers and green beans (RRGG)

F1:red flowers and green beans (RrGg)

Dominant traits: Red color of flower and green color of bean.

F1 x F1

The ratio = 9:3:3:1

9 red flowers and green beans

3 white flowers and green beans

3 red flowers and purple beans

1 white flowers and purple beans

=200/16= 12.5

9x 12.5= 112.5 red flowers and green beans

3 x 12.5 = 37.5 white flowers and green beans

3 x 12.5 = 37.5 red flowers and purple beans

12.5 white flowers and purple beans