which of the following best explains the observation that the drugs can effectively control blood cholesterol levels in individuals who are heterozygous but are not effective in individuals homozygous for the mutant allele? responses the drugs repair the mutant allele by copying the wild-type allele. the drugs repair the mutant allele by copying the wild-type allele. the drugs prevent cholesterol from entering the liver cells in individuals who are heterozygous but not in individuals who are homozygous for the mutant allele. the drugs prevent cholesterol from entering the liver cells in individuals who are heterozygous but not in individuals who are homozygous for the mutant allele. cholesterol molecules primarily bind to hdl receptors in individuals with fh. cholesterol molecules primarily bind to hdl receptors in individuals with fh. there must be at least one copy of the wild-type ldl receptor allele to produce functional ldl receptors.