Question

Consider the garden pea cross WwGg X WwGg, where W = round, w = wrinkled, G = yellow, and g = green. What proportion of the offspring is expected to be round, green, AND true-breeding?

A. 1/16
B. 1/4
C. 1/2
D. 3/8

Answer 1

The proportion of offspring that are expected to be true-breeding round (WW) and green (gg) from a WwGg X WwGg cross is 1/16.

Step-by-step explanation:

The student asked what proportion of the offspring from a garden pea cross WwGg X WwGg would be round, green, and true-breeding. To find true-breeding (homozygous) individuals, we need both homozygous round (WW) and homozygous green (gg).

The offspring from a Ww X Ww cross that will give us WW is 1/4, as this is the homozygous proportion. Similarly, the offspring from a Gg X Gg cross that are gg is also 1/4. Applying the product rule, the proportion of offspring that are both WW and gg is (1/4) × (1/4), which equals 1/16.