In humans, dimples are dominant over non dimples. A man who has dimples marries a woman who does not have dimples. They have 8 children, of which 6 have dimples. What is the genotype of these 6 children?
Since non dimples are recessive, they can only receive the non dimples from mom. To have dimples, they must receive a dominant gene from dad.
To determine the genotype of the children, we need to first understand the concept of dominant and recessive alleles. In this scenario, the presence of dimples is dominant over non-dimples. Let's assign letters to represent the alleles: D for dimples (dominant) and d for non-dimples (recessive).
Since the man has dimples, we can assume that his genotype is DD. However, since the woman does not have dimples, her genotype must be dd.
When the couple has children, each parent can pass on one randomly selected allele to their offspring. The possible combinations are as follows:
Father's alleles: D D
Mother's alleles: d d
Now, let's consider the possible combinations when they have children:
1. Child: Dd
2. Child: Dd
3. Child: Dd
4. Child: Dd
5. Child: Dd
6. Child: Dd
7. Child: dd
8. Child: dd
Out of the 8 children, 6 have dimples (Dd), while the other 2 do not (dd).
Therefore, the genotype of the 6 children with dimples is Dd.