THe Evolution of Populations into distinct species
In chapter 17, Charles Darwin meets Gregor Mendel. Much of the focus in this chapter is applying what we learned about genetics to what we learned about Natural Selection.
Darwin stated that there is variation in populations - that variation comes from the different alleles and genotypes in the gene pool. Darwin stated that the variation was passed from generation to generation..... but, where does the variation come from? It comes from sources like mutation and recombination. Darwin stated that natural selection is "choosing" the winners and losers...... well, what is being "chosen?" It is the phenotypes that determine the winners and losers. From there, we will look at the conditions necessary for a varied population to actually begin to break into completely separate species. What are the driving forces and requirements which push a single population into two or more completely different specie? |
Section OneSection One lays out the basics of population genetics. Basically, what happens when Darwin meets Mendel? We look at the origins of variation and diversity within populations. We look at how evolution, in genetic terms, is changes in allele frequency within a population over time.
Section ThreeSection Three looks at the requirements for larger speciation events. How does a single species diverge into new and district species? What are the driving forces and requirements to see speciation take place?
Online Natural Selection Lab
Chapter Review:All Multiple Choice, Plus: 4,5,9,11,17,22,26,31,34,35,36,39,40
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Section TwoSection Two examines various mechanisms which affect evolution and natural selection at a population level. How natural selection act on individual traits in a population? What circumstances can set the stage for a population to begin to branch off into more distinct groups?
Section FourSection Four looks at the reasons evolution might be a simpler process than scientists first realized. We examine "genes that control genes" and how these switches might control the expression of similar genes in different organisms. How is it that one set of genes, in all animals, might be at work in producing so many different body plans?
Test Preparation:Multiple Choice: Vocabulary and Key Questions
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