Medical
Biology
Definition and Types of Evolution
Population Genetics
Population Interaction
Question
Given below is the diagrammatic representation of natural selection of different traits.
a) Identify the type of natural selection A, B and C with an explanation of each.
b) Define Hardy-Weinberg principle
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Solution
a) A. Stabilization selection - It is seen when extreme phenotypes on both ends of the spectrum are unfavourable resulting in the reproductive success of those near the mean.
B. Directional selection- It is the condition in which organisms at one extreme corner in the range of phenotypes are favoured over the other organisms in the range.
C. Disruptive selection- It is the condition in which organisms at both extremes in a range of phenotypes are favored over the ones present in the middle of the range.
b) Hardy–Weinberg principle states that allele and gene frequencies in a population will remain constant from one generation to the next if certain conditions are kept constant. These conditions are-
1) Population is large
2) Random mating
3) Absence of mutation