12. A recessive allele t is responsible for a condition called dystonia. A man w
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12. A recessive allele t is responsible for a condition called dystonia. 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.)
12. A recessive allele t is responsible for a condition called dystonia. 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.Explanation / Answer
B. The father is tt; the mother is Tt.
As the condition is recessive, both the man and the affected child must have the genotype tt. The genotype of the mother must be Tt. This is because if the her genotype were TT, the genotype of all the children would be Tt and they would not have the condition. And if the genotype of the mother was tt, she would also have the condition.
Therefore the genotype of the father is tt, mother is Tt. the genotype of the other cildren not having the condition is Tt.
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