Warfarin Is a Popular and Potent Rodent Poison, as Well

Multiple Choice

Warfarin is a popular and potent rodent poison, as well as a blood-thinning medicine.Rats that have one copy of the allele for resistance to warfarin have increased resistance and thus better survival in an environment with warfarin.Rats that are homozygous for this allele are less fit than heterozygotes, even in the presence of warfarin, because they have much higher requirements for vitamin K.Which best describes what occurs in an environment with warfarin?

A) Heterozygote deficiency
B) Heterozygote advantage
C) Muller's ratchet
D) Homozygote advantage
E) Frequency-dependent selection