SAT Subject Biology Practice Question 128: Answer and Explanation

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Question: 128


According to the pedigree, what is the most likely genotype of individual III-5?

A. Carrier
B. Unaffected
C. Homozygous recessive
D. Homozygous dominant
E. Heterozygous

Correct Answer: C


The individual indicated exhibits the trait, but neither of her parents do. This indicates that the trait is due to recessive alleles and that the daughter must have inherited two copies of this allele.

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