The number of kinds of gametes produced by a dihybrid is

Options

A. 2
B. 4
C. 6
D. 8

Answer

To determine the number of kinds of gametes produced by a dihybrid organism, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Dihybrid Cross**: A dihybrid cross involves two traits, each represented by two alleles. For example, consider traits for seed color (Yellow - dominant, Green - recessive) and seed shape (Round - dominant, Wrinkled - recessive).

2. **Identify the Genotype of the Dihybrid**: A typical dihybrid organism will have a genotype that includes both dominant and recessive alleles. For instance, if we denote Yellow (Y) and Green (y) for color, and Round (R) and Wrinkled (r) for shape, a dihybrid organism could have the genotype YyRr.

3. **Determine the Possible Gametes**: Each gamete will receive one allele from each gene. For the genotype YyRr, the possible combinations of alleles can be determined by considering each trait:
- From the seed color gene (Yy), the possible alleles are Y and y.
- From the seed shape gene (Rr), the possible alleles are R and r.

4. **Combine the Alleles**: The combinations of alleles from both traits will give us the different types of gametes. The combinations are:
- YR (Yellow Round)
- Yr (Yellow Wrinkled)
- yR (Green Round)
- yr (Green Wrinkled)

5. **Count the Types of Gametes**: From the combinations above, we can see that there are 4 unique types of gametes that can be produced by the dihybrid organism.

### Conclusion:
The number of kinds of gametes produced by a dihybrid is **4**.

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