To determine the frequency of the [tex]\( T2 \)[/tex] allele in the given population, we need to follow these steps:
1. Calculate the Total Number of Individuals:
We first sum up the numbers of individuals for all genotypes.
[tex]\[
\text{Total individuals} = 50 (\text{T1T1}) + 60 (\text{T1T2}) + 40 (\text{T1T3}) + 50 (\text{T2T2}) + 55 (\text{T2T3}) + 45 (\text{T3T3}) = 300
\][/tex]
2. Count the Total Number of [tex]\( T2 \)[/tex] Alleles:
The [tex]\( T2 \)[/tex] alleles come from the genotypes:
- [tex]\( T2T2 \)[/tex]: Each [tex]\( T2T2 \)[/tex] individual contributes 2 [tex]\( T2 \)[/tex] alleles.
- [tex]\( T1T2 \)[/tex] and [tex]\( T2T3 \)[/tex]: Each [tex]\( T1T2 \)[/tex] and [tex]\( T2T3 \)[/tex] individual contributes 1 [tex]\( T2 \)[/tex] allele.
Counting the alleles gives:
[tex]\[
\text{Total } T2 \text{ alleles} = 2 \times \text{(number of T2T2 individuals)} + \text{(number of T1T2 individuals)} + \text{(number of T2T3 individuals)}
\][/tex]
Substituting the given numbers:
[tex]\[
\text{Total } T2 \text{ alleles} = 2 \times 50 (\text{T2T2}) + 60 (\text{T1T2}) + 55 (\text{T2T3}) = 100 + 60 + 55 = 215
\][/tex]
3. Calculate the Frequency of the [tex]\( T2 \)[/tex] Allele:
Each individual has 2 alleles. Thus, the total number of alleles in the population is:
[tex]\[
\text{Total alleles} = 2 \times \text{Total individuals} = 2 \times 300 = 600
\][/tex]
The frequency of the [tex]\( T2 \)[/tex] allele is:
[tex]\[
\text{Frequency of } T2 = \frac{\text{Number of } T2 \text{ alleles}}{\text{Total number of alleles}} = \frac{215}{600} \approx 0.3583
\][/tex]
4. Convert the Frequency into a Percentage:
[tex]\[
\text{Percentage of } T2 = 0.3583 \times 100 \approx 35.83\%
\][/tex]
Hence, the correct answer is:
B. [tex]\( 36\%\)[/tex] (rounded to the nearest percent).
