If C is dominant to c, what fraction of offspring will show the recessive phenotype when two heterozygous parents are crossed?
A)0/4
B)1/4
C)2/4
D)3/4
E)4/4

Question

Quizplus · Accepted Answer

When two heterozygous parents are crossed (Cc x Cc), they can produce four possible offspring genotypes: CC, Cc, cC, and cc. However, since C is dominant to c, both CC and Cc genotypes will show the dominant phenotype. Therefore, only the cc genotype will display the recessive phenotype. The chances of a heterozygous parent passing on the recessive allele to its offspring is 1/2. So, the probability of both parents passing on the recessive allele would be (1/2) x (1/2) = 1/4 or 25%. Therefore, 1/4 or 25% of the offspring will show the recessive phenotype.

If C Is Dominant to C, What Fraction of Offspring