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  4. During meiosis, a microspore mother cell has 12 bivalents, the number of chromosomes in its pollen grains will be:

Q. During meiosis, a microspore mother cell has 12 bivalents, the number of chromosomes in its pollen grains will be:

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Solution:

Meiosis is a reductional type of division where the chromosome numbers are halved in the daughter cells formed. During the meiotic division process, there is formation of bivalents which are paired homologous chromosomes. If cell has 12 bivalents, then the mother cell will have 24 chromosomes.
Pollen grains are formed from each of the daughter cell formed after a complete meiotic process of a microspore mother cell. Thus, the chromosomes in pollen grain will be half of the mother cell which is 12.