Q. ‘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.
A) Human population of Pitcaim island
B) Polydactylic dwarfs in Amish population
C) Long –necked giraffe
D) Industrial melanism
Explanation
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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.