Genetics question?

Posted on 2016-03-10 18:37:00 in Biology by SMITH

Mrs Smith is the sister of a patient who suffers 
from disease X, which is inherited in an autosomal 
recessive manner and which has a carrier 
frequency of 1 in 10 in the general population. 
The carriers of disease X are not adversely 
affected and are phenotypically identical to the 
normal population. Mrs Smith is fit and well and is 
thinking about having children with her husband, 
who is not affected by disease X and who has no 
family history of disease X. Mrs Smith wants to 
know what the probability of her child suffering 
from disease X is. Which ONE of the following is 
the correct answer? 

A) 0 
B) 1/15 
C) 1/20 
D) 1/60 
E) 1/80

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