science
Grade-10
Easy

Question

Which of the following does not cause variation?

  1.  New gene combinations by meiosis

  2. Errors occurring during replication

  3. Mitosis

  4. Mutations caused by environmental factors

hintHint:

Crossing over genes is important for genetic variation.

The correct answer is:

Mitosis


    • Mitosis is the process of cell replication in which a cell divides into two genetically identical daughter cells.
    • At various stages of mitosis, the cell's chromosomes are replicated and evenly distributed to the two new nuclei of the daughter cell. There is no crossover during mitosis.
    • Therefore, there is no possibility of recombination or genetic variation. Therefore, meiosis results in significant genetic variation, whereas mitosis does not.

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