Which one occurs once in life cycle (a) Replication of DNA (b) Replication of chromosomes (c) Meiosis (d) Mitosis..

Dear student.

The correct answer is ​(c) Meiosis.

Meiosis is a reductional division which occurs in gametes i.e. cells involved in sexual reproduction. It occurs during the formation of gametes to make the cells haploid (n) i.e. the number of chromosomes becomes half before fertilization so that the number of chromosomes and ploidy of the organism is retained in the zygote.

Regards.

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Dont all of them occur throughout the lifecycle of an organism.
Or is there a specific organism for which the question is being asked?
  • -1
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