Why is it extremely uncommon for a female to have hemophilia

Why is it extremely uncommon for a female to have hemophilia??

http://answers.yahoo.com/question/index?qid=20091202164149AAyddrE

Cool question. I guess you’re referring to hemophilia A or B. Hemophilia is an X linked disorder meaning that the hemophilia gene is on the X chromosome. It’s also recessive. The simplest way to put this is that to be a girl = XX and boys =…

Related Questions Answered on Y!Answers

why is it extremely uncommon for a female to have hemophilia?

Q:

A: Cool question.I guess you’re referring to hemophilia A or B. Hemophilia is an X linked disorder meaning that the hemophilia gene is on the X chromosome. It’s also recessive.The simplest way to put this is that to be a girl = XX and boys = XY. Therefore the boy only needs one hemophilia gene to show the trait, whereas the girl needs two hemophilia genes to show the trait.Hope that makes sense

Genetic disorders and human genetics?

Q: 3.Hemophilia is caused by a recessive allele on the X chromosome.a. Draw a Punnett square that shows how a mother whose blood clots normally can have a daughter with hemophilia. Include the genotypic and phenotypic ratios.b. What is the father’s genotype and phenotype?c. Why is it extremely uncommon for a female to have hemophilia?*I don’t get how to set up the punnett square,so as you can see im having a hard time figuring out this problem.**

A: a. The genotypes on the top of the “box” I made are the mothers. The h indicates that she is a carrier for hemophilia. b. The father’s genotype is on the right side (XhY). He must have hemophilia because his daughter would need to have received an allele from each of her parents because the disorder is recessive.c. It is uncommon to have a female with hemophilia because she must have two copies of the allele that causes hemophilia for it to be expressed.X h X _______ XhXh XhX Xh_______ YXh YX Y_______