Question

Name and describe the three results of natural selection that can create changes in the percentages of alleles in a population?

Answer 1

Every individual of a population has a selection pressure which decides that which will get opportunity to thrive well or will be eliminated from the population. This kind of selection pressure is called natural selection pressure or natural selection. Natural selection promotes the best fit genotype according to changing environmental conditions and eliminates the other genotype thus leading to genetic drift (loss of any allele from a homogeneous gene pool which occurs due to random fluctuation of any allele in a gene pool).

Three results of natural selection that can create changes in the percentages of alleles in a population are:

1. Directional selection: The type of natural selection which favors superior genotype and eliminates the inferior and intermediate genotype. In the history of evolution the most common natural selection is directional natural selection.
2. Stabilizing selection: The type of natural selection which favors intermediate genotype but eliminates extreme genotype (inferior and superior).
3. Disruptive selection: The type of natural selection which favors extreme genotype but eliminates intermediate genotype. For example, predator of Papilio butterfly prefers intermediate body size butterfly because small butterfly escape from its mouth and large butterfly does not fit in its mouth.