Assume that there is a gene in apples that determines fruit color and a second gene that determines fruit size. let a represent the dominant allele for big apples, and a represent the recessive allele for small apples. similarly, let rrepresent the dominant allele for red apples, and rrepresent the recessive allele for 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 of the new 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

Option A , AArr and aaRr

Explanation:

Given -

a)  A represent the dominant allele for big apples, and a represent the recessive allele for small apples.

b) R represent the dominant allele for red apples, and r represent the recessive allele for yellow apples

Phenotype of parents -

Parent I - big yellow apples

Possible genotype for parent I will be - AArr or Aarr

Parent II - small red apples - aaRR or aaRr

So the most probale genotype of parents would be AArr and aaRr

The cross between the two results the offspring as shown into the attachment

hence, option A is correct

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