If the D allele is completely dominant over the d allele,what percentage of the offspring will have the dominant phenotype when two heterozygous individuals mate?
A) 25 percent
B) 50 percent
C) 75 percent
D) 100 percent

Question

Quizplus · Accepted Answer

If the D allele is completely dominant over the d allele, then both DD and Dd genotypes will express the dominant phenotype. Therefore, in a cross between two heterozygous individuals (Dd x Dd), there will be a ratio of 3:1 dominant to recessive phenotypes in the offspring. Specifically, 25% will be homozygous dominant (DD), 50% will be heterozygous dominant (Dd), and 25% will be homozygous recessive (dd). Thus, 75% of the offspring will express the dominant phenotype.

If the D Allele Is Completely Dominant Over the D