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Answer on Other Biology Question for Zahra

Question #9856
In a human family,the female has a form of deafness determined by an autosomal recessive allele.What's the probability that her phenotypically normal brother is heterzygous for the gene?
Expert's answer
the probability is 1/2. The brother with the normal phenotype could have two
alleles without a form of deafness or he could be a heterozygote. If he has a
heterozygote he has 1 normal allel and 1 recessive allele with a form
of deafness. The probability of the latter is 1/2, that is the answer.

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