A mating between close relatives increases homozygosity primarily because it increases the chance that offspring receive:
Correct answer: D. Identical alleles by descent
- A. Extra chromosome copies
- B. New alleles by mutation
- C. Different alleles at each locus
- D. Identical alleles by descent
Explanation
Related parents are more likely to carry copies of the same ancestral allele. Their offspring therefore have a higher probability of receiving identical alleles by descent, which raises homozygosity.
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