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Question
How many meiotic and mitotic divisions occur during the development of male gametophyte from the mother cell?
Options
One meiotic and two mitotic
Two meiotic only
Two mitotic only
One mitotic and one meiotic
Solution
One meiotic and two mitotic
Explanation:
During microsporogenesis, microsporocytes undergo:
- One meiotic division: To produce a tetrad of four haploid microspores. The released microspores undergo a highly asymmetric division.
- 1st Mitosis: To produce a bicellular pollen grain with a small germ cell engulfed within the cytoplasm of a large vegetative cell. The germ cell undergoes a further mitotic division.
- 2nd Mitosis: To produce twin sperm cells.
So the correct answer is one meiotic and two mitotic divisions.
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