How many meiotic divisions are required for the formation of 100 pollen grains? Answer is 25 .can you explain this answer?

Question

Answer

4 pollen grains are produced through 1 meiotic division.

so,1 pollen grain is produce through 1/4 meiotic division.

thus,for 100 pollen grains, no of pollen grain required =
1/4*100=25 meiotic division.

Answer

Through every meiotic division,4 pollen grains are produced...hence no. of meiotic divisions required to produce 100 pollen grains are;
100*4=25
Thus 25 is the correct answer

Answer

Formation of Pollen Grains through Meiotic Divisions

In plants, meiosis is the process responsible for the formation of pollen grains. Each pollen grain contains male gametes required for sexual reproduction. Let's understand how meiotic divisions result in the formation of 100 pollen grains.

1. Meiosis I: Reduction Division
During meiosis I, the diploid cell (2n) undergoes two successive divisions resulting in the formation of two haploid cells (n) called daughter cells. This division can be divided into four phases:

- Prophase I: Chromosomes condense, homologous chromosomes pair up and undergo crossing over, leading to genetic recombination.
- Metaphase I: Homologous pairs align at the cell's equator.
- Anaphase I: Homologous chromosomes separate and move towards opposite poles.
- Telophase I: Nuclear envelope reforms, and the cells divide into two daughter cells.

During meiosis I, the original cell gives rise to two daughter cells, each with half the number of chromosomes as the parent cell (n).

2. Meiosis II: Equational Division
The two daughter cells resulting from meiosis I undergo further division during meiosis II to form four haploid cells. This division also consists of four phases:

- Prophase II: Chromosomes recondense, and the nuclear envelope breaks down.
- Metaphase II: Chromosomes align at the equator of each cell.
- Anaphase II: Sister chromatids separate and move towards opposite poles.
- Telophase II: Nuclear envelope reforms, and the cells divide into four haploid daughter cells.

Each of these daughter cells is called a pollen grain, and they contain half the number of chromosomes as the original cell (n).

Calculation:
Each original cell undergoing meiosis will give rise to four pollen grains. Therefore, to calculate the number of meiotic divisions required for the formation of 100 pollen grains, we can use the formula:

Number of meiotic divisions = Total number of pollen grains / Number of pollen grains produced per division

Number of meiotic divisions = 100 / 4 = 25

Hence, 25 meiotic divisions are required to produce 100 pollen grains.

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