A couple who are both phenotypically normal have a child who expresses a sex-linked recessive trait.?

A couple who are both phenotypically normal have a child who expresses a sex-linked recessive trait. Which of the following represents this child's genotype? Let the trait T designate dominant and t be designate recessive.





A. Tt


B. tt


C. Xt Xt


D. XtY


E. Both C and D could be correct.

A couple who are both phenotypically normal have a child who expresses a sex-linked recessive trait.?
The answer is D because dad is hemizygous dominant and mom is heterozygous since both are normal. The kid got the Xt from mom and Y from dad. The kid couldn't get the bad gene from dad because if dad had it to give, then dad wouldn't be normal.
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Reply:D
Reply:b is correct answer
Reply:The answer is actually D, not E.





If Xt Xt were correct, then the Father must be Xt Y, which is phenotypically abnormal.
Reply:She's right, the answer's E
Reply:e
Reply:Definitely E
Reply:D. If it were C, The father would have to be XtY, which would make his phenotype abnormal.





ie. The father has to be XTY to be normal, and if the XT gene were passed on, the child would e phenotypically normal too.


The mother must be XTXt.