What is the risk of hemophilia for her children? II3 in the pedigree - ProProfs Discuss
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What is the risk of hemophilia for her children? II3 in the pedigree below has two brothers with hemophilia A, a bleeding disorder that is inherited as an X-linked recessive trait.



A. 1 in 4 for a son, close to zero for a daughter
B. 1 in 2 both for sons and daughters
C. 1 in 2 for a son and 1 in 4 for a daughter
D. 1 in 2 for a son, close to zero for a daughter
E. 1 in 4 both for sons and daughters

This question is part of Pedigrees Quiz
Asked by Wyatt Williams, Last updated: Mar 25, 2020

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3 Answers

John Adney

John Adney

Answered Dec 14, 2016

Isn't it 1 in 2 for boy because you only get 2 boys in the punnet square and 1/2 of them are affected. I didn't think you included boy and girl results? If so then I understand 1/4. Hopefully that makes sense.. very tired.
 

dukhyil

Dukhyil

Answered Dec 11, 2016

1 in 2 for a son and 1 in 4 for a daughter

 

John Smith

John Smith

Answered Oct 24, 2016

1 in 4 for a son, close to zero for a daughter
 1

freddygoodman

No you are not correct

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