10-18-2006, 01:13 PM
20 y/o man is phenotypically normal, but 2 of his sibblings dies from Tay sach. what is the riski that this man is a heterozygote carrier ?
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genetics - interndoc
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10-18-2006, 01:24 PM
wow...3 differnt answer ?
ok...tell me how do you guys derived the answer
10-18-2006, 01:30 PM
Tay Sachs is an autosomal rececive disease. knowing that both parents must be carriesr to have children that have Tay Sachs disease. Then to be a carrier in autosomal recessive disease is: 1/2 carriers , 1/4 normal 1/4 diseased
and that how I come up with 50% of chance that 20 year old to be carrier.
10-18-2006, 01:33 PM
oh...s..should me 50 rite interndoc???
q s about carrier..think i overlooked it a answered for affected chance??
10-18-2006, 01:34 PM
100% he must have a defective gene and since he does not thave the disease then he is a carrier
10-18-2006, 01:35 PM
Oh gosh....I overlooked the question, I thought that 2 of his sons died of Tay sachs. Thats such a big mistake......... Yes 50% is correct
10-18-2006, 01:38 PM
answer is 2/3 or 75%
your homework tonight is to figure this out |
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