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Assertion: Variations are important for ...

Assertion: Variations are important for the process of evolution.
Reason: Meiosis increases the genetic variability in the population of organisms from one generation ot the next.

A

If both assertion and reason are true and reason is the correct explantion of assertion

B

If both assertion and reason are true but reason is not the correct explnantion of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Meiosis involves exhange of genes between homologous chormosomes. So, the gametes produced are genetically different from each other. Offspring produced by the fusion of gametes also show recombination of genetic variations. These variations in the offspring make organisms more adaptable to the enviroment and these have a definite role in evolution.
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NCERT FINGERTIPS-CELL CYCLE AND CELL DIVISION-Cell Cycle And Cell Division
  1. A bivalent of meiosis i consists of

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  2. Cells which are not dividing are likely to be at

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  3. Which of the events listed below is not observed ruing mitosis?

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  4. Identify the wrong statement about meiosis.

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  5. Select the correct statement about G(1) phase.

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  6. Assertion : Interphase occupies 75-95% of the total generation time. ...

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  7. Assertion: Some cells enter G(0) phase leading to inactivation of cell...

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  8. Assertion: G(1) phase is the interval between mitosis and initiation o...

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  9. Assertion: Prophase is the first stage of mitosis which follows S and ...

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  10. Assertion: Small disc-shaped structures at the surface of the centrome...

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  11. Assertion: During anaphase, centromere of each chromosome splits and c...

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  12. Assertion: Karyokinesis follows cytokinesis. Reason: Karyokinesis is...

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  13. Assertion: Cell growth results in disturbing the ratio between the nuc...

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  14. Assertion: The process of pairing of the chromosomes is called synapsi...

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  15. Assertion: Crossing over leads to recombination of genetic material on...

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  16. Assertion: The crossing over is an enzyme-mediated process. Reason:...

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  17. Assertion: The final stage of meiotic prophase I is diplotene. Reaso...

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  18. Assertion: The stage between the two meiotic divisions is called inter...

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  19. Assertion: Metaphase II begins with splitting of centromere of each ch...

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  20. Assertion: Variations are important for the process of evolution. Re...

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