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Choose the correct answers from the alternatives given : Meiosis involves:

1. two nuclear divisions with chromosomes dividing only once
2. two nuclear divisions with chromosomes dividing twice
3. two nuclear divisions with chromosomes dividing four times
4. one nuclear division with chromosomes dividing only once

Correct answer: two nuclear divisions with chromosomes dividing only once

Solution

Meiosis consists of two successive nuclear divisions: meiosis I and meiosis II. Chromosomes are replicated once before meiosis begins, then the homologous chromosomes separate in the first division and sister chromatids separate in the second, so the chromosomes effectively divide only once in terms of replication.

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