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Question
The pedigree above represents four generations of a family affected by albinism, an autosomal recessive trait.
What are the genotypes of the parents of individual 2 in generation 2?
The pedigree above represents four generations of a family affected by albinism, an autosomal recessive trait.
What are the genotypes of the parents of individual 2 in generation 2?
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Solution
The correct option is C Aa and Aa
The individual who is affected by albinism has an autosomal recessive trait (aa). The individual 2 in generation 2 is affected, which means the genotype is aa. For the daughter to receive the genotypeaa, one allele is received from mother and one allele is received form father. This means that both the parents must have allele a. But the parents are not affected. So, the genotype of the parents is Aa and Aa. Thus, the correct answer is option C.
The individual who is affected by albinism has an autosomal recessive trait (aa). The individual 2 in generation 2 is affected, which means the genotype is aa. For the daughter to receive the genotypeaa, one allele is received from mother and one allele is received form father. This means that both the parents must have allele a. But the parents are not affected. So, the genotype of the parents is Aa and Aa. Thus, the correct answer is option C.
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