Question

In a particular animal, genes C and D are unlinked. A plant of genotype C/C D/D is crossed with one of genotype c/c d/d. The F1 animals are then testcrossed. What percent of the F2 generation is expected to be c/c d/d?

a) 25%
b) 50%
c) 75%
d) 100%

Answer 1

In this particular cross, b) 50% of the F2 generation is expected to be c/c d/d.

Step-by-step explanation:

To determine the percent of the F2 generation expected to be c/c d/d, we need to understand the inheritance pattern. In this case, genes C and D are unlinked, which means they assort independently. That means the alleles for gene C will segregate into gametes independently of the alleles for gene D.

When you cross a plant of genotype C/C D/D with one of genotype c/c d/d, the F1 generation will all be C/c D/d. In a testcross, the F1 generation is crossed with plants of genotype c/c d/d. So, when the F1 animals are testcrossed, we expect 50% to be c/c d/d.

Therefore, the answer is b) 50%.