In humans having dimples is a dominant trait. in order for a child to have dimples...?
I don't know D: xD
One parent must have the dominant trait for dimples.
In order for a child to have dimples, they must inherit at least one copy of the dominant allele for dimples from one of their parents. Let me explain how this works:
Our genes come in pairs, with one copy inherited from each parent. For the dimples trait, there are two possible alleles (forms of the gene): one for dimples (D) and one for no dimples (d).
Since dimples are a dominant trait, only one copy of the D allele is needed for a person to have dimples. So, there are three possible combinations of alleles: DD (homozygous dominant), Dd (heterozygous), and dd (homozygous recessive).
If both parents have dimples and carry at least one D allele, there are a few possible scenarios for their child:
1. If both parents are homozygous for the dominant trait (DD x DD), then all of their children will have dimples because they will inherit one D allele from each parent (DD).
2. If one parent is homozygous for the dominant trait and the other is heterozygous (DD x Dd), then, on average, 75% of their children will have dimples (DD or Dd) and 25% will not have dimples (dd).
3. If one parent is homozygous for the dominant trait and the other is homozygous for the recessive trait (DD x dd), then all of their children will have dimples because they will inherit one D allele from the parent with dimples (Dd).
So, having at least one parent with dimples increases the chances of a child having dimples, but it is possible for a child to have dimples even if neither parent has them, as long as both parents carry at least one copy of the D allele.