'A brief reduction in size of a population, due to natural calamities, usually leads to random g

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6.Evolution

normal

'A brief reduction in size of a population, due to natural calamities, usually leads to random genetic drift'. For this statement, identify the correct example from the following.

Human population of Pitcaim island

Polydactylic dwarfs in Amish population

Long -necked giraffe

Industrial melanism

Solution

The variations that occur by chance in a small population are collectively called random genetic drift. It is of two types, $i.e.,$ founder effect and bottleneck effect. Bottle necks are natural calamities like earth quake, floods, tsunamis, etc, $e.g.,$ polydactylic dwarf individuals are more in old order Amish population of Lankaster in USA.

Standard 12

Biology