Q. What is true about the isolated small tribal populations?
A) There is no change in population size as they have a large gene pool
B) There is a decline in population as boys marry girls only from their own tribe
C) Hereditary diseases like colour blindness do not spread in the isolated population
D) Wrestlers who develop strong body muscles in their life time pass this character on to their progeny
Explanation
[Solution from source] A small isolated tribe has a small gene pool and no gene flow, so marriage within the tribe leads to inbreeding depression and can contribute to population decline. Inbreeding actually helps recessive hereditary disorders like colour blindness spread, and acquired traits such as a wrestler's muscles are not inherited. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.