The percentage of recombination involving the seed shape and seed colour in a plant is 10%. What is the distance (mu) between the genes on a chromosome controlling these characters?

Options

A. 5
B. 10
C. 20
D. 15

Answer

To solve the problem regarding the distance (mu) between the genes controlling seed shape and seed color in a plant, we can follow these steps:

### Step-by-Step Solution

1. **Understand Recombination Frequency**: The percentage of recombination frequency indicates how often recombination occurs between two genes on a chromosome. In this case, it is given as 10%.

2. **Relate Recombination Frequency to Map Units**: Recombination frequency is directly proportional to the distance between the two genes on a chromosome. This distance is measured in map units (mu), where 1 map unit is equivalent to a 1% recombination frequency.

3. **Calculate the Distance in Map Units**: Since we know that 1% recombination corresponds to 1 map unit, we can calculate the distance for the given recombination frequency:
- Given recombination frequency = 10%
- Therefore, the distance (in map units) = 10% = 10 map units.

4. **Conclusion**: The distance between the genes controlling seed shape and seed color is 10 map units (mu).

### Final Answer
The distance (mu) between the genes on a chromosome controlling seed shape and seed color is **10 map units**.

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