Question

The number of classes of phenotypes in the $F_2$ of a cross between dihybrids involving both the genes with incomplete dominance would be______

• A. Six
• B. Nine
• C. Sixteen
• D. Eight

Answer 1

Answer: (D)

Eight

Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles. In this case, the F2 generation of a cross between dihybrids involving both the genes with incomplete dominance would result in developing eight different classes of phenotypes as evident from the calculation and phenotype variation in the Punnett square.

So the correct option is 'eight'.