Question

Using a to represent the wild-type allele and a for the mutant allele, identify the genotype of each family member.

Answer 1

If we have a wild-type allele of AA, and Aa for the mutant allele, the possible genotype of the off-springs can be determined using the Punnett Square.
 __| A    |  A  |
  A | AA | AA |
 a  | Aa |  Aa |

Thus, all the off-springs will show the trait for the allele.