A further option is to mate the sire to his daughter. Which choice corresponds to this option?

• A. Mate the sire to his daughter
• B. Mate to a random population of known allele frequency
• C. Mate the sire with a dams that are known carriers
• D. Mate the sire with a dam that is homozygous recessive

Answer: (A)

Mating a sire to his daughter is inbreeding, a close-relatives mating. This increases homozygosity across the genome, raising the chance that recessive deleterious alleles become homozygous in offspring. For a parent-offspring pairing, the inbreeding coefficient is 0.25, meaning about 25% of loci are identical by descent in the offspring. This can help fix certain traits but carries the risk of inbreeding depression and reduced genetic diversity. The other options describe different mating approaches (outcrossing toward a known allele frequency, or matings involving carriers or a homozygous recessive dam) but none specify the close-relative parent-offspring mating shown here.