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Q.

Which one of the following is an example of a genetic bottleneck?

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a

Stabilising selection

b

Genetic drift

c

Convergent evolution

 

d

Directional selection

answer is B.

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Detailed Solution

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  • A generational change in allele frequencies is known as genetic drift. In tiny populations, the frequency of a single allele might vary significantly just by chance. 
  • Even while creatures do not travel from one location to another, occasionally their populations may experience dramatic declines. 
  • Flooding, drought, or any other environmental change could be to blame for this. A random genetic sample of the original population may be made up of a few survivors. 
  • The bottleneck effect refers to the changes and genetic variability loss that ensue.
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