The Pedigree Shown Here Pertains to a Trait Due to a Rare

question 51

Multiple Choice

The pedigree shown here pertains to a trait due to a rare, X-linked recessive mutation. Individual 1 has an affected brother and husband, but the genotypes and phenotypes of individuals 1, 3, and 4 are unknown. What is the probability that individual 1 is heterozygous? What is the probability that individual 3 is affected? What is the probability that individual 4 is affected?

• A)1/2; 1/4; 1/4
• B)1/2; 0; 1/2
• C)1; 1/2; 1/4
• D)1; 1/2; 1/2
• E)1; 1/4; 1/4

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