Final answer:
The probability of a child having dimples is determined by the alleles that each parent carries. If both parents have dimples, the child will definitely have dimples. If one parent has dimples and the other does not, the child has a 50% chance of having dimples.
Step-by-step explanation:
The probability of a child having dimples depends on the alleles that each parent carries. Dimples are a dominant trait, meaning they are represented by the allele 'D', while no dimples is represented by the recessive allele 'd'.
If both parents have dimples (genotype DD), their child will definitely have dimples.
If one parent has dimples (genotype Dd) and the other does not (genotype dd), the child will have a 50% chance of having dimples and a 50% chance of not having dimples.