- #1

TytoAlba95

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- Homework Statement
- About 1% individuals in a population suffer from a genetic disorder. The cause was traced to such individuals being homozygous recessive for a single locus with two alleles. The elder of the two children of a family(where both the parents are normal) suffers from the disorder, while the younger one is normal. What is the probability that the third child will be a normal daughter?

(a) 49.5%

(b)12.5%

(c)37.5%

(d)25%

- Relevant Equations
- Ans: (c)

Attempt:

The disorder is autosomal recessive.

The probability = Probability of being a daughter x Probability of an affected child being born = ½×¼ = 1/8 x100 =12.5%