Dihybrid plants from how many types of pollen grains :-

Options

A. One
B. Two
C. Four
D. Eight

Answer

To determine how many types of pollen grains are formed by dihybrid plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Dihybrid Plants**: A dihybrid plant is one that has two different traits, each represented by two alleles. For example, consider a plant with two traits: height (T/t) and color (R/r).

2. **Genotype Representation**: Let's represent the genotype of a dihybrid plant as TtRr, where:
- T = tall (dominant)
- t = short (recessive)
- R = red (dominant)
- r = white (recessive)

3. **Law of Independent Assortment**: According to this law, the alleles for different traits segregate independently during gamete formation. This means that the alleles for height and color will assort independently.

4. **Gamete Formation**: To find the types of pollen grains (gametes) produced, we can combine the alleles for each trait:
- From Tt, we can have T or t.
- From Rr, we can have R or r.

5. **Combining Alleles**: We can combine these alleles to form the following gametes:
- TR (Tall and Red)
- Tr (Tall and White)
- tR (Short and Red)
- tr (Short and White)

6. **Counting the Types of Gametes**: From the combinations above, we see that there are a total of 4 different types of gametes (pollen grains) that can be formed by the dihybrid plant.

7. **Final Answer**: Therefore, the dihybrid plants form 4 types of pollen grains.