Genotype of plant is `(, ,)/(ab)` and there is 18% recombination present in it then percentage of gametes will be :-

Options

A. AB=9%
B. ab=18%
C. Ab=9%
D. aB=41%

Answer

To solve the problem of determining the percentage of gametes based on the given genotype and recombination percentage, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotype and Recombination Percentage**:
- The genotype of the plant is given as `(, ,)/(ab)`, which indicates that we have two alleles (A and B) on one chromosome and two alleles (a and b) on another chromosome.
- The recombination percentage is given as 18%.

2. **Understand Parental and Recombinant Gametes**:
- In a typical dihybrid cross, we can have parental gametes (AB and ab) and recombinant gametes (Ab and aB).
- The parental gametes are produced without crossing over, while recombinant gametes are produced as a result of crossing over.

3. **Calculate the Percentage of Recombinant Gametes**:
- The total percentage of gametes is 100%. If 18% of the gametes are recombinant, then the remaining gametes must be parental.
- Therefore, the percentage of parental gametes = 100% - 18% = 82%.

4. **Determine the Distribution of Gametes**:
- Parental gametes (AB and ab) will make up the majority of the gametes, while recombinant gametes (Ab and aB) will make up the remaining.
- Since there are two parental types and two recombinant types, we can distribute the percentages accordingly:
- Parental gametes (AB and ab) = 82% (combined)
- Recombinant gametes (Ab and aB) = 18% (combined)

5. **Calculate Individual Gamete Percentages**:
- Since the parental gametes are equally likely, we can divide the parental percentage by 2:
- Percentage of AB = 82% / 2 = 41%
- Percentage of ab = 82% / 2 = 41%
- For the recombinant gametes, we also divide the recombinant percentage by 2:
- Percentage of Ab = 18% / 2 = 9%
- Percentage of aB = 18% / 2 = 9%

6. **Final Summary of Gamete Percentages**:
- AB = 41%
- ab = 41%
- Ab = 9%
- aB = 9%

### Conclusion:
The percentage of gametes is:
- AB = 41%
- ab = 41%
- Ab = 9%
- aB = 9%