how do you calculate? - manik

[ArchivalUser]

A man is a known heterogyous carrier of a mutation that causes hemochromatosis. Suppose that 1% of the general population consists of homozygous mutation. If the man mates with somebodyfrom the general population what is the probability that there would be an affected child born to them?

[ArchivalUser]

the recessive gene frequency in general population is sqrt (1/100) = 1/10,
so the probability is 1/2 (because he is a carrier) * 1/10 = 1/20

[ArchivalUser]

your ans is correct.

but dont u have to consider any possibility of the mate being homozygous?

[ArchivalUser]

it will be a lot easier to do the math with gene frequency rather than thinking two genotype frequencies separately, the results are the same though.

[ArchivalUser]

the probability of homozygous is 1/100 and that of heterozygous is 18/100
so 1/2 *1/100 + 1/4 *18/100 = 1/20

[ArchivalUser]

thanks a lot for clearing my doubt.GL.

[ArchivalUser]

urw