It is far more common to find human genetic disease caused by __________ alleles than by __________ alleles because __________.

• A. dominant; recessive; dominant alleles have an evolutionary advantage over recessive alleles
• B. dominant; recessive; dominant alleles became dominant because they aid the survival of the organism carrying them
• C. recessive; dominant; even when homozygous, recessive alleles usually do not cause as much damage as dominant alleles
• D. None of the listed responses is correct.
• E. recessive; dominant; harmful recessive alleles can survive in the heterozygote without any selection pressure against them