NEET 2008 Biology question

What is true about the isolated small tribal populations?

(1)There is no change in population size as they have a large gene pool
(2)There is a decline in population as boys marry girls only from their own tribeCorrect
(3)Hereditary diseases like colour blindness do not spread in the isolated population
(4)Wrestlers who develop strong body muscles in their life time pass this character on to their progeny

Answer: (2)

Solution

In a small isolated tribe, marriage takes place only within the group, so there is no gene flow (migration) and inbreeding increases; this reduces variation and fitness and leads to a decline in the population. Hence option (2). (1) is wrong because a

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Question ID VK-090058