Q. In humans, a dimple in chin is a dominant characteristic.

1. A man who does not have a chin dimple has children with a woman with chin dimple whose mother lacked the dimple. What percentage of their children would be expected to have a chin dimple?

2. A man with a chin dimple and a woman who lacks the dimple produce a child who lacks dimple. What is the man's genotype?

3. A man with a chin dimple and a non dimpled woman produce eight children, all having the chin dimple. Can you be certain of the man's genotype? Why or why not? What genotype is more likely, and why gives reason?