destroyer 102

[pistolpete007]

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what happens in x-linked recessive and x-linked dominant again?

 

[Simiam]

What are you trying to ask?

X-linked recessive is aka sex linked, like colorblindness. It means that if the mother is a carrier and the father is normal she has a 50% chance of having a colorblind male and a 50% chance of having a carrier daughter. I think it just signifies that X linked recessive is predominant in males, and the X linked dominant will be seen in both sexes.

 

[far123]

if it was x-linked recessive in the second generation all the males should be affected...and if it was dominantX-linked all of the girls in the third generation had the desease

 

[thebozz1975]

what happens in x-linked recessive and x-linked dominant again?

Look at all your posts! Seriously, crack open a book!

 

[Kkae]

X-linked dominant: a gene on the X chromosome is dominant. Females are more likely to be affected than males since they have 2 X chromosomes that could carry the abnormal gene, whereas a male has just 1. If you know about the Lyon's hypothesis, it states that an X-inactivation renders only one copy of the X-chromosome in each cell therefore only a 1/2 of the cells would have the abnormal gene. So if a father has it o his one X chromosome he can't pass it to his son because his son gets his X chromosome from his mom but the daughter will defenitely have it, if the mother has it. There's a 50% chance a mother with the disorder can pass it to her offspring.

X-linked recessive: just that mutations in a gene on the X-chromosome causes the phenotype to be expressed in hemizygous males and homozygous females.