According to chance, what fraction of their children will have dimples?
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To determine the fraction of their children that will have dimples, we need to consider the probability of inheriting dimples from both parents. Here are the steps to calculate it:
1. Identify the genotype of each parent: Dimples are caused by a dominant gene (D), while no dimples are caused by a recessive gene (d). Let's say one parent has a genotype DD (dimples) and the other parent has a genotype Dd (dimples carrier).
2. Determine the possible genotypes of their offspring: Each parent will randomly pass on one gene to their child. So the possible genotypes of the children will be:
- Parent 1: DD
- Parent 2: Dd
3. Analyze the possible combinations: By pairing the genotype of each parent, we get the following possibilities for their children:
- DD × Dd: All the children will have dimples (DD genotype).
- DD × DD: All the children will have dimples (DD genotype).
4. Calculate the fraction: As we can see, in both scenarios, all the children will have dimples. Therefore, the fraction of their children with dimples is 1 (or 100%).
Remember, this explanation assumes that dimples follow a simple dominant/recessive genetic pattern, which may not always be the case in real-life situations.