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a recessive cell 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? A. The Father is tt; the mother is Tt B. the Father is Tt; the mother is TT C. Both parents are TT. D. The father is tt;The mother is TT

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Thurtle
Both parents have to have at least one t allele. However, since you said the father has it, and it is recessive, that means the father has the genotype: tt.

That leaves us with A and D. 

It cannot be D though because the mother has two dominant traits.

Therefore your answer would be A