Modern Native Americans have very high frequencies of Type O blood. In some places in North and South America, the frequency is as high as 100%. Anthropologists believe that early Native Americans arrived in North America by crossing over the Bering Land Bridge around 15,000 years ago, from East Asia. Modern East Asian populations, with whom modern Native Americans share ancestry, do not have high frequencies of Type O blood. Instead, they have some of the lowest frequencies of Type O blood in the world. 1. What forces of evolution are at work? a. Mutation.
b. Natural Selection.
c. Genetic Drift.
d. Gene Flow.
2. Specifically, how is natural selection involved?
3. Explain how the forces of evolution shift allele frequencies in the population over time. Your answer should include all of the â€˜forcesâ€™ of evolution that you identified as being employed (above). Put this information into a narrative to explain how new traits are introduced, how individuals are selected (if present), and how alleles in the population shift over time.

This can be explained as there is no mutation taking place and only the flow of genes takes place and the alleles are continuous throughout the population irrespective of time.

2. Natural selection takes place as a result of a greater survival rate of individuals having blood groups most suitable for their environment.

3. There are four forces of evolution, they are mutation, gene flow, genetic drift, and natural selection.

A . Mutations are the changes taking place in a gene of the games of individuals so that those traits are passed over to the next offspring/generation produced.

B. Gene flow occurs when the Hardy-Weinberg equation is disturbed, that is when an individual move out or a new individual comes into the population. thus new genes are introduced into the population and the gene pool is disturbed.

C. Genetic drift is the small changes taking place in the gene of individuals in a small population.

D. Natural selection - the ultimate force of evolution that ensures the survival or destruction of a species. the fittest of a population survive while the weaker ones get eliminated.

Modern Native Americans have very high frequencies of Type O blood.

In some places in North and South America, the frequency is as high as 100%. Anthropologists believe that early Native Americans arrived in North America by crossing over the Bering Land Bridge around 15,000 years ago, from East Asia.

Modern East Asian populations, with whom modern Native Americans share ancestry, do not have high frequencies of Type O blood. Instead, they have some of the lowest frequencies of Type O blood in the world.

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