Biology

Aron Porter

9 September, 03:32

In humans, hemophilia is caused by a recessive allele on the x chromosome. therefore, if a female with hemophilia has children with a normal male, the probability that their first child will be a girl with hemophilia is zero. this assumes normal dosage compensation where the x that is inactivated in females varies randomly from cell to cell. but suppose the normal mechanism of dosage compensation is altered so that the x that is inactivated in any given female is random but the same x is inactivated in every cell of her body. in this case, what is the probability that their first child would be a girl with hemophilia? (express the probability as a percent. enter the number only without the percent sign. for example, enter 100% as 100 and enter 12.5% as 12.5)