GENETIC question

[eleena]

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can someone explain this question for me

a certain autosomal recessive condition is seen in approximately 1 in every 50
people, but are symptom-free. if a male and female are both carriers of the gene, what is the probability that they have a diseased child?

 

[Danny289]

can someone explain this question for me

a certain autosomal recessive condition is seen in approximately 1 in every 50
people, but are symptom-free. if a male and female are both carriers of the gene, what is the probability that they have a diseased child?

this question from Destroyer has wrong answer, there was a thread while ago when the question says parents are carrier you don't need that 1/50(.02%). the answer will be 25% (Aa X Aa).

 

[dl9006]

this question from Destroyer has wrong answer, there was a thread while ago when the question says parents are carrier you don't need that 1/50(.02%). the answer will be 25% (Aa X Aa).

so why is it you don't need the 1/50?

 

[youngmc27]

the 1/50 is the traits incidence in the population. If we didn't know one of the parents were carriers then it would be used but since we know that each parent is a carrier. The each have a 50% chance of passing on the trait. The odds of both of them passing on the trait is 1/2 * 1/2 = 1/4 or 25%.