A sample of individuals from a given population are collected to estimate the allele frequencies for the population at large.
Data on 5 STR loci are provided:
| Individual | CSF1PO | D3S1358 | D5S818 | D7S820 | D8S1179 |
|---|---|---|---|---|---|
| 1 | 5,6 | 3,3 | 10,15 | 16,19 | 3,5 |
| 2 | 10,10 | 6,7 | 12,12 | 14,14 | 7,7 |
| 3 | 7,8 | 3,4 | 12,14 | 19,20 | 3,5 |
| 4 | 7,7 | 5,5 | 11,12 | 14,17 | 4,5 |
| 5 | 5,5 | 4,4 | 10,11 | 15,16 | 4,4 |
| 6 | 11,13 | 3,8 | 13,14 | 17,17 | 4,4 |
| 7 | 12,13 | 7,8 | 14,14 | 18,19 | 6,9 |
| 8 | 13,13 | 5,5 | 10,14 | 19,20 | 5,5 |
| 9 | 7,9 | 5,5 | 11,12 | 14,20 | 4,5 |
| 10 | 10,11 | 3,6 | 10,11 | 15,15 | 4,4 |
| 11 | 11,13 | 3,8 | 13,14 | 17,19 | 4,4 |
| 12 | 12,12 | 6,7 | 14,14 | 18,20 | 6,9 |
| 13 | 6,6 | 5,5 | 10,14 | 14,15 | 5,5 |
| 14 | 5,12 | 4,7 | 14,14 | 18,19 | 6,9 |
| 15 | 11,13 | 5,5 | 10,15 | 20,20 | 5,5 |
Based on the sample of 15 individuals above, what is the frequency of Allele 13 for CSF1P0? Typically, this frequency is calculated from a population. Here, the 15 individuals are the “population.” Write your answer as a decimal.
The frequency of allele is calculated by:
number of desired allele / total number of alleles.
Now we have to calculate the frequency of allele 13 for CSF1P0.
The number of alleles 13 for CFS1PO is 6
Total number of alleles for CFSP1O is 30
Allelic frequency of 13 for CFSPO is 6/30= 0.2
Answer is 0.2
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