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Genetic drift, changes in allilic frequ...

Genetic drift, changes in allilic frequency due to change factors, occurs in populations that are very

A

isolated

B

small in number

C

mobile

D

closely adapted to local environments

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The correct Answer is:
B
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Fill up the balnks in the following paragraph by selecting the correct option. When migration of a section of population to another place and population occurs, I change in the original as well as in the new population new genes/ alleles are added to the ii, population and these are lost from the population. These would be a iv if this gene migration, happens multiple times. if the same change occurs by chance, it is called v. sometimes the change in allele frequency is so different in the new sample of population that they become a diffrent species. The original drifted population becomes founders and the effect is called vi

ARIHANT NEET-MECHANISM OF EVOLUTION-Chapter Exercises (A) Taking it together (Assorted Questions of the Chapter for Advanced Level Practice )
  1. The variations are of which following kinds?

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  2. The possibilities of of hereditary and evolutionary changes are greate...

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  3. Genetic drift, changes in allilic frequency due to change factors, oc...

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  4. Of the following, which consistently pushes populations toward a bette...

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  5. Which of the following can contribute to genetic drift?

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  6. Natural selection acts on an organism's

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  7. Interdependent genea, with relative functions, form

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  8. Population of dark biston betularia increased greatly in england from ...

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  9. Two individuals from different populations attempt to mate but are una...

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  10. Population of khaibab squirrels on north rim of the grnd canyon do not...

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  11. The kaibib squirrels, described before, are the example of

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  12. Most often the factor that initiates the speciation of two populations...

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  13. In galapagos finches, adaptive radiations occurred…………. Islands, while...

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  14. Since in the pleistocence ice age,deserts have gradually formed in sou...

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  15. Two organisms of different species mate and produce an offspring canno...

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  16. Which of the following cause phenotypic variation among the organisms ...

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  17. Which of the following increases the number of different alleles in a ...

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  18. Natural selection is best defined as occuring when the environment cau...

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  19. Miceoevolution can be measured by compairing observed allelic frequenc...

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  20. In diploid organisms, veriations is not subjected to natural selection...

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