Question

A = big apples; R = red apples; a = small apples; r = yellow apples.

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) AArr and aaRr
(B) Aarr and aaRr
(C) AARr and Aarr
(D) AaRr and AaRr
(E) AaRr and aarr

Answer 1

AArr and aaRr

Step-by-step explanation:

The genotype for the big apples is AA whereas the genotype of the small apples is aa. Let the genotype of red apples be RR and the genotype of yellow apples is rr.

The cross between yellow big apples and small red apples can be done as follows:

AArr × aaRr/aaRR. (Since, the Red apple is dominant trait it can express itself in heterozygous condition.

Thus, the correct answer is option (A).