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1 Introduction to evolution
1 Introduction to evolution
Patterns of evolution course outline / Patterns of Evolution Glossary / Introduction to evolution - handout
Evolution Powerpoint (the terrible homemade job version!)
Pass NCEA Biology website - heaps of videos
Here are some good videos to help introduce the concept of evolution
2 Gene pools and evolution
2 Gene pools and evolution
The definition of evolution is "the change in the gene pool of a popluation from generation to generation"
Genes themselves don't change so much (unless they mutate!) but what does change is the frequency of certain alleles. As you can imagine the forms of genes (alleles) that are most suited to a place are going to remain behind while others, less suited, will quickly be removed. (A quick simulation on how allele frequencies change in a population of ants)
NO CHANGE IN ALLELE FREQUENCIES MEANS NO EVOLUTION
Factors that can lead to changes in gene pools are called Agents of Change. (Agents of change video ) . Agents of change include:
1. Gene flow
Basically the migration of new individuals (new alleles) into or out of the population.
2. Genetic drift
Chance events (e.g. Tsunami) that can effect the allele frequency (especially so in smalll populations) e.g. bottle neck effect, founder effect.
3. Natural selection.
Video about Darwin's theory of evolution and Darwin's finches on Galapagos Island
Darwin's finches matching game
4. Non-random mating or mate selection
Mates are choosing mates based on certain phenotypes (e.g. big tail feathers in male Peacocks) which leads to change in allele frequencies.
5. Mutations
Ultimate source of new alleles...plonk a new allele into a population and allele frequencies will change of course!
3. Websites
3. Websites
Websites that are useful to follow
Insights into why sickle cell anemia can be biological advantage.
Heterozygous Advantage and sickle cell anemia
Gene duplication If you can excuse the accent then this is a good extended explaination for duplication
Selection including natural selection, gene drift and Migration in a population An article from the Kahan academy that has useful background information to help you learn how these affect allele frequency in a population.
https://phet.colorado.edu/en/simulation/natural-selection a simulation website that lets you adjust and multiply rabbits to show how natural selection works.
https://www.studystack.com/flashcard-1495794 some questions on allele frequency in populations
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