Question

three mitotic divisions which occur in the megaspore are

Answer 1

hi mate

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here is ur answer ^↓^

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the three mitotic divisions which occur in the megaspore are

1) formation of gametes

2)crossing over of chromosomes

3) fusion of gametes


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Answer 2

Answer:

The haploid megaspore or megaspore undergoes 3 rounds of mitotic division called nuclear mitosis because only karyokinesis (a division of the nucleus) takes place. Only after the 3rd mitotic division, cytokinesis or division of cytoplasm occurs, when nuclei migrate and cytoplasm surrounds each of the nucleus and walls are formed.

Explanation: Megaspore is formed within Megasporangia by the process known as megasporogenesis. Megametogenesis is the process in which 3 mitotic division takes place when a megaspore formed in megasporangesnsis develops into an embryo sac or multinucleated gametophyte.

3 mitotic division of megaspore results in the formation of 8 nuclei in 1 cell and after the formation of walls, a distinction can be made in the classification below-:

8 haploid nuclei comprised in 7 cells- 2 synergids, 1 egg cell, a central cell with 2 nuclei, and 3 antipodals.

A diagram is attached below.