3. Elizabeth is married to John, and they have four children. Elizabeth has a straight nose
(recessive) and is able to roll her tongue (dominant). John is also able to roll his tongue,
but he has a convex (Roman) nose (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-are unable to roll their tongues. Please
answer the following questions about this family.
a. What are the genotypes of Elizabeth and John?
b.
Elizabeth's father was a straight-nosed roller, while her mother was a convex-nosed
non-roller. What can you figure out about their genotypes?
c. John's father was a straight-nosed roller, while his mother was a convex-nosed
roller. What can you determine about their genotypes?
d. Diagram the three described generations of this family in accepted pedigree form,
including the phenotypes for these two traits.