Problem A. You cross two homozygous parents: RRYY (round yellow) and rryy (wrink

Question

Problem A. You cross two homozygous parents: RRYY (round yellow) and rryy (wrinkled green) to produce an F1 generation. Round seeds are dominant, yellow seeds are dominant. You cross two F1s to produce the F2 generation. In the F2 generation, you find an individual with round yellow seeds. You do a testcross to find out the genotype of this “mystery” dominant/dominant phenotype. In the offspring of the cross, you find ½ have round yellow seeds and ½ have wrinkled yellow seeds. 1. Based on these data what was the genotype of the mystery F2?

Explanation / Answer

Answer: The genotype of the mystery F2 : RrYY

Explanation:

RRYY (round yellow) x rryy (wrinkled green)---P1

RrYy (round yellow)----------------F1

In F2 generation, 4 types of geneotype indicate round yellow seeds.

RRYY, RRYy, RrYY & RrYy.

Mystery dominant.dominant phenotype (RrYY ) x rryy (tester parent)----Testcross

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