How many times meiosis will take place for the formation of 80 wheat grains ?

Options

A. 100
B. 80
C. 40
D. 99

Answer

To determine how many times meiosis will take place for the formation of 80 wheat grains, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Gamete Formation**:
- In wheat, the microspore mother cell (male gamete) undergoes meiosis to produce 4 haploid male gametes.
- The megaspore mother cell (female gamete) undergoes meiosis to produce 1 haploid female gamete.

2. **Calculating Female Gametes**:
- Since each wheat grain corresponds to one female gamete, for 80 wheat grains, we need 80 female gametes.

3. **Calculating Male Gametes**:
- Each meiosis of the microspore mother cell produces 4 male gametes.
- Therefore, to find out how many meioses are needed to produce enough male gametes for 80 female gametes, we need to calculate how many male gametes are produced for each meiosis:
\[ \text{Number of male gametes produced} = 4 \text{ (from one meiosis)} \]

4. **Finding the Number of Meiosis for Male Gametes**:
- To find out how many meiosis events are required to produce enough male gametes to match the 80 female gametes, we divide the total number of female gametes by the number of male gametes produced per meiosis:
\[ \text{Number of meiosis for male gametes} = \frac{80 \text{ (female gametes)}}{4 \text{ (male gametes per meiosis)}} = 20 \]

5. **Total Meiosis Calculation**:
- Since each female gamete corresponds to one meiosis event, we have:
- 80 meiosis events for female gametes (1 meiosis per female gamete).
- 20 meiosis events for male gametes.
- Therefore, the total number of meiosis events is:
\[ \text{Total meiosis} = 80 \text{ (for female)} + 20 \text{ (for male)} = 100 \]

### Final Answer:
The total number of meiosis events required for the formation of 80 wheat grains is **100**.