Question

evolution: genetic drift - the founder effect
the founder effect is when a small number of individuals from a population establish a new population in a different area, e.g. through migration or geographic isolation. these individuals may not represent the original population and the allele frequency can change abruptly. lets look at an example of this:
two red birds are blown onto a new island in a storm. drag & drop the birds, then describe how the frequency of each allele differs between the two populations

Explanation:

The original bird - population has alleles B and b with different genotypes (BB, Bb, bb). The two red birds blown to the new island are likely bb (as red is associated with bb). In the original population, there are multiple genotypes with both B and b alleles present. In the new population on the island (with just two red birds), the allele frequency is 100% b if the red birds are bb, while in the original population, the frequency of B and b alleles is different depending on the number of each genotype.

Answer:

In the original population, there are multiple alleles B and b with various frequencies based on the number of BB, Bb, and bb genotypes. In the new island population with two red birds (assumed to be bb), the allele frequency is predominantly b (100% b if they are both bb), which is a significant change from the original population's allele frequencies.