Question

A recessive allele t is responsible for a condition called distonia. A man who has this condition marries a woman who doesn't. One of their four children has the condition. What are the possible genotypes of the man and the woman? (Hint: To help you answer this question, create a Punnett square for each possibility.)

A. The father is Tt; the mother is TT.
B. The father is tt; the mother is TT.
C. The father is tt; the mother is Tt.
D. Both parents are TT.

Answer 1

Dad has distonia - must be tt.
Mom doesn't have distonia, but she passes on an allele for the disorder to one of her children - must be Tt.

Answer 2

so a

Answer 3

c

Answer 4

kk