Crossing of a homozygous wild type with a mutant that is heterozygous for a dominant mutation will result in F1 progeny of whichA) all show the mutant phenotype. B) half show the wild-type phenotype and half show the mutant phenotype. C) three-fourths show the wild-type phenotype and one-fourth show the mutant phenotype. D) all show the wild-type phenotype.

Half show the wild-type phenotype and half show the mutant phenotype.

Explanation:

The dominant mutation means that the mutation can express itself even in the heterozygous condition as well. The cross between homozygous unaffected wild type (aa) is crossed with the heterozygous (Aa) is as follows;

Parents aa * Aa

progeny: Aa, Aa (affected) and aa, aa (unaffected).

Thus, 505 individual are unaffected and 50% individual are affected.

Hence, the correct answer is option (B).