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?
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Expert's answer
2012-05-24T10:29:49-0400
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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