Question

What is true about the isolated small tribal populations?

• A. Hereditary diseases like colourblindness do not spread in the isolated population.
• B. Wrestlers who develop strong body muscles in their lifetime pass this character onto their progeny.
• C. There is no change in population size as they have a large gene pool.
• D. There is a decline in population as boys marry girls only from their own tribe.

Answer 1

The correct option is D There is a decline in population as boys marry girls only from their own tribe.

A strong muscle of a wrestler is an acquired character that can be obtained by regular exercise which will not be transmitted to the next generation. Gene pool of a population will consist of a large number of genes which will vary in their frequencies. These frequencies also depend on the proportion of various genotypes in the total population. The small tribal population will have the small gene pool. Hereditary diseases like colourblindness will spread in isolated population due to inbreeding. There is a decline in population as boys marry girls only from their own tribe, this is due to the absence of gene migration or gene flow. Thus, the correct answer is option D.