Question

1. what is the relationship between genetic drift and population size? explain using specific evidence from figure 1.
2. why is it significant when an allele reaches a frequency of 1 in a population?

Explanation:

1. Genetic drift is more pronounced in smaller populations. In Figure 1 (not provided here but generally), smaller - sized populations show greater fluctuations in allele frequencies over time compared to larger populations. This is because chance events have a relatively larger impact on the gene pool of small populations.
2. When an allele reaches a frequency of 1 in a population, it means the allele is fixed. All individuals in the population are homozygous for that allele. This represents a loss of genetic variation at that locus in the population. It can be due to natural selection, genetic drift, or other evolutionary forces, and can have implications for the population's adaptability and future evolution.

Answer:

1. Genetic drift has a stronger effect in smaller populations as shown by greater allele - frequency fluctuations in small populations compared to large ones in Figure 1.
2. An allele at a frequency of 1 is fixed, resulting in loss of genetic variation at that locus in the population.