The diagram shows the frequency of alleles A and a in a population over three generations. The starting allele frequency of A is p = 0.6
Generation 1 AAaAaa aaAAAa p = 0.6
Generation 2 A
p = 0.5
Generation 3 a a a a a 8AAA a D = 0.3
The population remains in the same location and does not experience any environmental changes. Which best describes what is happening to the population over three generations?
Oa reproductive isolation
b genetic drift
C founder effect
d
allopatric speciation
b genetic drift
Genetic drift is the random fluctuation of allele frequencies in a population over time due to chance events. In this case, the frequency of allele A decreases from 0.6 to 0.5 in Generation 2, and then further decreases to 0.3 in Generation 3. This change in allele frequencies is not due to natural selection or any other selective force, but rather is due to random chance events happening in the population.