Punnet square is used to know

Options

A. Outcome of a cross
B. Probable result of a cross
C. Types of gametes
D. Result of meiosis

Answer

### Step-by-Step Solution:

1. **Understanding the Punnett Square**:
- The Punnett square is a tool used in genetics to predict the outcome of a genetic cross. It was developed by Reginald C. Punnett, a British geneticist.

2. **Purpose of the Punnett Square**:
- The main purpose of the Punnett square is to visually represent all possible combinations of gametes that can occur during fertilization. This helps in understanding how traits are inherited from parents to offspring.

3. **Setting Up the Punnett Square**:
- To create a Punnett square, you write the possible gametes of one parent along the top (usually the male) and the possible gametes of the other parent along the side (usually the female).

4. **Filling in the Punnett Square**:
- Each box within the square represents a possible genotype of the offspring that can result from the combination of the gametes from both parents.

5. **Calculating Probabilities**:
- By analyzing the filled Punnett square, you can calculate the probability of different genotypes appearing in the offspring. This is crucial for understanding inheritance patterns.

6. **Conclusion**:
- Therefore, the Punnett square is primarily used to know the probable result of a genetic cross, as it allows for the calculation of the likelihood of various genotypes in the offspring.

### Final Answer:
The Punnett square is used to know the **probable result of a cross**.