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What is true about the isolated small tribal populations?
A
Wrestlers who develop strong body muscles in their life time pass their character on to their progeny
B
There is no change in population size as they have a large gene pool
C
There is a decline in population as boys marry girls only from their own tribe
D
Hereditary disease like colour-blindness do not spread in the isolated population
Detailed Solution
An isolated small tribal population has a small gene pool, and marriages take place only within the tribe.
Such continued marriage among close relatives is inbreeding, which increases homozygosity.
Harmful recessive genes come together in the homozygous state, causing inbreeding depression: lowered fertility, lowered vigour and a higher frequency of hereditary disorders.
As a result there is a decline in the population, because boys marry girls only from their own tribe.
Strong muscles developed by wrestlers during their life time are acquired characters and are not inherited.
A small isolated population does not have a large gene pool, and hereditary diseases such as colour-blindness actually become more common in it.
Such continued marriage among close relatives is inbreeding, which increases homozygosity.
Harmful recessive genes come together in the homozygous state, causing inbreeding depression: lowered fertility, lowered vigour and a higher frequency of hereditary disorders.
As a result there is a decline in the population, because boys marry girls only from their own tribe.
Strong muscles developed by wrestlers during their life time are acquired characters and are not inherited.
A small isolated population does not have a large gene pool, and hereditary diseases such as colour-blindness actually become more common in it.