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IBDP- Evolution and the Environment

Topic 5- Evolution

· IBDP BIOLOGY,IB,Evolution

In this IBDP Biology blog post, we will be looking at how natural selection and evoluton lead to environmental changes, let's get to it!

Evolution and Natural Selection  

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  • Genes are special sequences of As, Ts, Gs and Cs in DNA that encode for little cell machines called proteins. Each gene is unique whose protein does a unique job.
  • Variation in organisms is due to variations in the sequences of As,Ts,Gs and Cs

Basis of Natural Selection:

  1. The environment is a changing place
  2. Variation can influence whether organisms are reproductively successful in certain environments
  3. If successful, the organisms pass on their genes/ to the next generation
  4. That particular variety will become more prominent in the population.

Natural selection involves interactions between organisms and their environment

Evolution is measured by the changes in populations. 

Population Changes

Natural selection eventually leads to evolution as characters of the population changes. 

  • Eventually, these changes are so great the population becomes anew species that are so different they can’t reproduce with individuals from the older species.

Charles Darwin and Alfred Russel Wallace came up with this hypothesis

Darwin supported the idea that organisms developed in one place and then migrated around the earth.

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Geographical Isolation- Areas become geographically isolated which means individuals in the same species can’t interbreed and therefore lose certain variations depending on their environment 

That is all!

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References

  • https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.ebi.ac.uk%2Ftraining%2Fonline%2Fcourses%2Fhuman-genetic-variation-introduction%2Fwhat-is-genetic-variation%2F&psig=AOvVaw3z-9Y4NADqS8pmmReYjPEm&ust=1627284899747000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMD8jefa_fECFQAAAAAdAAAAABAD
  • https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.expii.com%2Ft%2Fgeographic-isolation-definition-examples-10264&psig=AOvVaw2cvMrxhXVZPRFacafUnzL4&ust=1627284964270000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMi1roTb_fECFQAAAAAdAAAAABAD

Drafted by Venetia (Biology)

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