Elizabeth is married to John, and they have four children. Elizabeth has a straight nose “n” (recessive) and dimples “D” (dominant). John has also dimples, but he has a convex nose “N” (dominant). Of their four children, Ellen is just like her father, and Dan is just like his mother. The other children Anne, who has a convex nose, and Peter, who has a straight nose have no dimples “d”.

1. What are the genotypes of Elizabeth and John?

2. Using a Punnett square determine possible genotypes of children.

3. Elizabeth’s father was a straight-nosed/ dimples, while her mother was a convex-nosed/ dimples. What can you figure out about their genotypes?

4. John’s father was a straight-nosed/ dimples, while his mother was a convex-nosed/dimples. What can you determine about their genotypes?