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

Question

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

Quizplus · Accepted Answer

If C is dominant, then the heterozygous parents will both have the dominant allele (C) and the recessive allele (c). When they are crossed, there is a 1/4 chance of each offspring receiving two recessive alleles (cc) and expressing the recessive trait. Therefore, the fraction of offspring that are homozygous recessive is 1/4.

If C Is Dominant to C, What Fraction of Offspring