Question

Some recessive genetic diseases are almost always fatal. However, in some populations, the recessive allele is found in greater frequencies than expected because there is heterozygous advantage for those carriers of the recessive alel . we this with the sickle cell allele. In this scenario, the sickle cell allele is maintained in populations with endemic malaria. What is this type of selection called?

directional selection

stabilizing selection

discruptive selection

no selection

What effects can a mutation have on an individual's fitness? ( select all that apply)

beneficial effects

deleterious effects

neutral/no effect at all

Answer 1

1. Option B, stabilizing selection

One type of heterozygote advanatage is balancing selection in which heterozygotes have an advantage over homozygotes.

2. All three are correct

Also have beneficial effect which leads to new version of proteins that helps the organism to adapt changing environment. Also have deleterious effect as the gene lost its function and cause several disease. Mutation can also have neutral effect in this mutation in those sequemce which are not useful or have no benefits.

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