Question

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 tongue. a. What are the genotypes of Elizabeth and John?

Answer 1

Elizabeth: nnTt

John: NnTt

Explanation:

NN- DOMINANT FOR CONVEX NOSE

nn- Recessive for straight nose

TT- DOMINANT FOR ROLLING TONGUE

tt- recessive for not rolling tongue.