Question

evolution: gene flow
another way that evolution can occur is by gene flow. this is when alleles are transferred from one population to another. these may be existing alleles which would increase the frequency of that allele, or they may be new alleles caused by mutations. this transfer can happen by individuals moving, or by their gametes (e.g seed dispersal in plants)
the diagram above shows two populations of frogs. the frogs in population one have a mutation results in them having red spots.

1. create an example of gene flow by moving two frogs from population 1 to population 2.

Explanation:

Step1: Identify the trait

The trait is the red - spot mutation in frogs of population 1.

Step2: Describe the gene - flow event

Two red - spotted frogs from population 1 cross the river and join population 2. These frogs will reproduce with the frogs in population 2. As a result, the alleles for the red - spot trait are now introduced into population 2. Over time, if these red - spotted frogs have successful offspring, the frequency of the allele for red spots in population 2 will increase.

Answer:

Two red - spotted frogs from population 1 move across the river and join population 2. They mate with the non - red - spotted frogs in population 2, introducing the allele for red spots into population 2's gene pool.