Science Homework Help

Grossmont College Natural Communication Discussion



In simplest terms, evolution can be defined as a change in allele frequency over time.  A fact of nature is that allele frequencies for any given gene are always in a state of flux and for that reason evolution is a fact of nature.  At the same time we have evolutionary theories that help us explain why allele frequencies change in the first place.  For this section we will explore these evolutionary mechanisms.  

What you are doing.

The purpose of this discussion board is meant for you to share an article or a news story that specifically deals with how evolutionary mechanisms are shaping nature around us.  For this discussion board you can only use the following evolutionary forces: Natural selection, sexual selection and gene flow.

What you have to do for points.

Give a short summary of what you read.

State the evolutionary mechanism involved and explain how that evolutionary mechanism is working to transform the population in question. 

Lastly, you will have to give an explanation of what is promoting the evolutionary change in the first place. 

For example, a bacteria will evolve resistance to antibiotics if antibiotics are always present.  In the absence of antibiotics, bacteria will have no need to evolve resistance to antibiotics.  Its the excessive use of antibiotics that is selecting for bacterial genes that enhance a bacteria’s level of fitness. 

You will have to respond to two other student posts. 

Make sure you cite your work so that others can follow the news article.


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