Below is the pedigree of a family with an autosomal recessive disorder. Analyze

Question

Below is the pedigree of a family with an autosomal recessive disorder. Analyze the pedigree to determine the probability of individual 3 being a carrier. Please write your answer as a probability from 0 to 1.

Below is the pedigree of a family with an autosomal recessive disorder. Analyze the pedigree to determine the probability of individual 3 being a carrier. Please write your answer as a probability from 0 to 1. Number 0.25 4 6 10 12 13 14 Incorrect. Individual 3 has an affected child which allows you to determine the genotypes of individual 3 and his partner. Consider which genotypes are possible for unaffected parents and what genotype they must have in order to produce an affected child for a trait with autosomal recessive inheritance. Remember to enter your answer as a probability from 0 to 1.

Explanation / Answer

The pedigree chart shows the inheritance of autosomal recessive disorder. When an individual is affected by the autosomal recessive disorder but both if their parents are not affected, then both of them must be carriers. In this pedigree chart, the individual 7, is affected but both of 7's parents are normal. So, both the individuals 3 and 4 must be carriers. Therefore the probability of individual 3 being a carrier is 1 or 100%.

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