Allele Frequency Calculation
First, calculate the frequency of the $A_1$ allele ($p$) using the given genotype frequencies:
The frequency of the $A_1$ allele ($p$) is calculated as: $p = f(A_1A_1) + \frac{1}{2} f(A_1A_2)$ Substituting the given values:
$p = 0.16 + \frac{1}{2} (0.48)$ $p = 0.16 + 0.24$ $p = 0.40$
Probability of Fixation by Genetic Drift
In the context of genetic drift, assuming the allele is neutral (no selection advantage), the probability of an allele eventually becoming fixed (reaching a frequency of 1.0) in the population is equal to its current frequency.
Therefore, the probability of fixation for the $A_1$ allele is its frequency, $p$.
Probability of Fixation for $A_1 = p = 0.40$.
This value ($0.40$) lies within the specified range of 0.39 to 0.41.
Important Questions from Genetic drift
- Which one of the following statements about genetic drift is accurate?
- A few years ago, a very small population of zebrafish became isolated by a newly built dam. As a result, which statement is most likely to be true about this population of zebrafish now?
- Which two of the following processes can result in a decline in heterozygosity in populations?
I) inbreeding; II) genetic drift; III) mutation; IV) random mating In a population of birds on an island, the average beak size reduced over one generation. A researcher estimated the association between beak size and relative fitness, shown in the graph. The estimated slope was –0.05 with a 95% confidence interval of -0.15 to 0.09.
Which one of the following evolutionary processes acting on beak size is the most likely reason for the observed reduction in beak size?
- Two isolated populations X and Y have 100 and 10000 individuals, respectively. Both populations have the same starting allele frequencies of p=0.5 and q=0.5. After 1000 generations of genetic drift, which of the following statements is true about the heterozygosity at this locus in these two populations?
