Answer:
B. 50%
Explanation:
The yellow trait is dominant (uppercase Y), so the heterozygous pairs (Yy) as well as the homozygous dominant pairs (YY) would be yellow. There are 2 pairs of Yy there for 50% of the offspring would have a yellow pod.
The controlled variable is what stays the same . So it’s C . They are given different amounts but the same food.