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NEET2008ZoologyOrganisms and PopulationsActual

What is true about the isolated small tribal populations?

Options

  1. AThere is no change in population size as they have a large gene pool
  2. BThere is a decline in population as boys marry girls only from their own tribe
  3. CHereditary diseases like colour blindness do not spread in the isolated population
  4. DWrestlers who develop strong body muscles in their life time pass this character on to their progeny

Correct answer

B. There is a decline in population as boys marry girls only from their own tribe

Step-by-step solution

The acquired character such as strong muscles of a wrestler obtained by regular exercise 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 proportion of various genotypes in the total population. Small tribal population will have small gene pool. Hereditary diseases like colour blindness will spread in isolated population due to inbreeding. There is a decline in population as boys m

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