Question

How many meiotic divisions are required for the formation of 100 functional megaspores?

Answer 1

For the formation of 100 Zygotes 125 meiotic divisions are needed.

A zygote is formed by the fusion of a haploid male and female gamete; Thus to determine the number of total meiotic division to produce 100 zygotes the total number of meiotic divisions in males and females has to be considered.

In males:

One meiotic division forms 4 male gametes, thus 25 meiotic division give 100 male gametes.

In females:

One meiotic division forms 1 egg cell, as the remaining 3 degenerate to provide nutrition to the developing egg cell. Thus 100 meiotic division gives 100 egg cells.

Hence the total number of meiotic divisions needed to form 100 zygotes = 25 meiotic division in males + 100 meiotic divisions in females = 125.

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Answer 2

The number of meiotic divisions required for the formation of 100 functional megaspores is 100.

Explanation:

• The diploid megaspores undergo meiotic division which leads to the formation of four haploid megaspores.
• Out of the four diploid megaspores, 3 megaspores degenerate leaving out 1 functional megaspore.
• The functional megaspore leads to the development of the embryo sac.
• Hence, it can be concluded that 100 meiotic divisions are required for the formation of 100 functional megaspores.

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