If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce,why doesn't that allele quickly become extinct in the population?

Question

Quizplus · Accepted Answer

Heterozygotes are carriers of the recessive allele but do not express the disease. Thus, even though it may not be beneficial for an individual to carry the recessive allele, it can persist in the population through generations of carriers.

If a Recessive Allele Causes a Fatal Disease That Kills