You have one tree that produces big yellow apples and another tree that produces small red apples. When the two are crossed, you find that half the offspring trees produce big red apples and half produce big yellow apples. What are the genotypes of the parents? A = big apples; a = small apples; R = red apples; r = yellow apples.

Given that;

A = big apples; a = small apples;

R = red apples; r = yellow apples.

The genotypes of the parents are;

AArr and aaRr

Explanation:

When the trees are crossed, Trees that produce big yellow apples could be AArr or Aarr while trees that produce small red apples could be aaRR or aaRr.

The big parent must be homozygous for A, because all the offspring are big.

The red parent must be heterozygous for red, because half the apples are red and half are yellow.

Therefore, the cross must be AArr and aaRr.

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