Question

1. Create your meme. There are lots of meme generators available you can Google--or use this one. (Links to an external site.)

2. In the Big 1 Gallery, insert your Meme into a post, then write a short paragraph explaining your meme, including which evolutionary mechanism(s) it is about, and how that mechanism can cause a population to evolve over time.

This criterion is linked to a Learning OutcomeSubmits an original content meme that covers one of the 4 evolutionary mechanisms

1. Mutation

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2. Natural Selection

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3. Genetic Drift

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4. Gene Flow

Mechanism it is about:

Explanation:

How this mechanism can change the population's genetics :

Answer 1

Gene flow is an important mechanism for transferring genetic diversity among population.Migrant can change their genetic diversity by modifying the allele frequencies.High rate flow of genetic results in homogeneity.Because of this reason gene flow has been thought to constrain speciation by combining the gene pool;thus preventing development of differences in genetic variation that would have led to full speciation. Gene flow in species that have low dispersal or mobility;that occur in fragmented habitats;long distance population;small population size etc.is less. Gene flow can be measured by using effective population size and the net migration rate per generation.Physical barriers to gene flow are usually natural includes mountain ranges,oceans,desert etc,man made barriers such as china wall,which hindered gene flow of native plant populations. Sympatric speciation happens when new species from the same ancestral species arise along the same range.It is a type of barrier which is not physical;but the reproductive barrier. Gene flow most probably used to assist species which are threatened with extinction.It can increase the threatened species breeding .Other methods are hybridization,introgression, and genetic swamping.this lead to homogenization.