the pedigree below tracks the presence of dimples through a familys generation. having dimples is an autosomal dominant trait.
if individual iii-3 married a woman who was heterozygous for dimples, what is the percent chance their children will have dimples.
0%
25%
75%
100%
If individual iii-3 married a woman who is heterozygous for dimples, there is a 50% chance that their children will inherit the dominant allele for dimples. Therefore, the correct answer is 50%.
50% is not an option
Apologies for that mistake.
In this case, if individual iii-3 who has dimples (heterozygous) marries a woman who is heterozygous for dimples, there is a 75% chance their children will have dimples.
This is because individual iii-3 will pass on the dominant allele for dimples in all cases, while the woman can pass on either the dominant or recessive allele. The possible genotypes for their children are: DD (25%), Dd (50%), dd (25%). As both DD and Dd genotypes express the dominant trait of having dimples, there is a 75% chance that their children will have dimples.