Dimples is a dominant trait. A man heterozygous for dimples marries a woman with no dimples.?

let's take "D" as the dominant trait and "d" as the recessive trait

Genotype of the man: Dd

Genotype of the woman: dd

use a punnet square for this

Possible genotypes of children: Dd and dd

Possible phenotypes of children: some with have dimples while some will have none

Probability of dimples in their children:

Dd - 50% probability

dd - 50% probability

Genotype of the man: Dd Genotype of the woman:dd Possible genotypes of children:Dd dd Possible phenotypes of children: Heterozygous Dimples, no dimples Probability of dimples in their children: 50%

Heterozygous means you have two different alleles. So, if the gene for dimples is D, then the dominant allele is D and the recessive allele (no dimples) is d. So, the man is Dd and the woman is dd. If they have children, the children are:

Dd x dd

Dd (dimples) or dd (no dimples)

The probability is that half of the children will have dimples, the other half won't.