How many meiosis are required to produce 101 seeds?

Options

A. 125
B. 126
C. 127
D. 404

Answer

To determine how many meiosis divisions are required to produce 101 seeds, we need to consider the formation of both pollen grains and egg cells, as each seed is formed from the fertilization of a pollen grain with an egg cell.

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells from one diploid cell. In plants, this process is crucial for the formation of gametes (pollen grains and egg cells).

2. **Pollen Grain Formation**:
- A microsporocyte (microspore mother cell) undergoes meiosis to produce four haploid pollen grains.
- Therefore, from one meiotic division, we get 4 pollen grains.

3. **Calculating Pollen Grains for 101 Seeds**:
- To produce 101 seeds, we need 101 pollen grains because each seed is formed from one pollen grain fertilizing one egg.
- Since one meiotic division produces 4 pollen grains, the number of meiotic divisions required for 101 pollen grains can be calculated as follows:
\[ \text{Meiotic divisions for pollen grains} = \frac{101 \text{ pollen grains}}{4 \text{ pollen grains per meiotic division}} = 25.25 \]
- Since we cannot have a fraction of a meiotic division, we round up to the next whole number, which is 26.

4. **Egg Cell Formation**:
- A megasporocyte (megaspor mother cell) also undergoes meiosis, but it produces only one functional megaspore (egg) out of four.
- Therefore, for each egg cell, one meiotic division is required.

5. **Calculating Eggs for 101 Seeds**:
- To produce 101 seeds, we need 101 egg cells.
- Thus, the number of meiotic divisions required for 101 egg cells is:
\[ \text{Meiotic divisions for eggs} = 101 \text{ (one for each egg)} \]

6. **Total Meiosis Required**:
- Now, we add the meiotic divisions required for pollen grains and eggs:
\[ \text{Total meiotic divisions} = 26 \text{ (for pollen grains)} + 101 \text{ (for eggs)} = 127 \]

### Final Answer:
The total number of meiosis required to produce 101 seeds is **127**.

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