Question

please choose correct options. options are in [] and are bold. there are 2 parts.

in a population, there is a single-gene, autosomal recessive disease with 2 alleles, D and d. The disease is deadly and kills patients at an early age. Over time, natural selection will    ["tend to reduce", "tend to increase", "have no effect on"]         the frequency of the d allele in the gene pool. But as this occurs, a                 ["smaller", "larger", "unchanged"]        fraction of d alleles will become hidden from selection in carriers

Answer 1

Ans) Over time, natural selection will tend to reduce frequency of the d allele in the gene pool. But as this occurs a smaller fraction of d alleles will become hidden from selection in carriers.

Explaination:Natural selection negatively select d allele tha leads to decrease in frequency of d allele in gene pool. But recessive d allele never eliminated completely from population gene pool because small fraction of d allele remain hidden in heterozygotes or carriers(Dd) and become hidden from selection.