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Exploring DNA and Populations: The Key to Understanding Species Relationships

Learn about the significance of DNA sequences in determining species relationships. Explore concepts such as cell structure, DNA composition, and genetic sequencing techniques through informative resources and images. Discover how analyzing DNA can unveil the evolutionary history of organisms.

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Exploring DNA and Populations: The Key to Understanding Species Relationships

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  1. DNA & Populations http://www.flickr.com/photos/bwjones/4344712708/

  2. Let’s Review • What is a cell? How many cells make up an organism? • What is the nucleus? • What is DNA? What is it made up of? • What is a sequence of DNA called? • Why is DNA important? • What is one way that DNA sequences can change? Image sources: http://www.jimmyjanesays.com/sketchblog/2007/04/plant-cell.html (Plant cell) http://www.biologycorner.com/bio1/DNA.html (DNA diagram)

  3. How do we know gene sequences? • Geneticists use a technique called gel electrophoresis • This technique breaks apart a gene in a predictable way, allowing scientists to piece the sequence back together http://www.flickr.com/photos/micahb37/3080247531/ http://www.flickr.com/photos/14508691@N08/1472624764/

  4. http://www.flickr.com/photos/arcticpuppy/3020931978/ Why is this important? • DNA sequences can tell you how species are related • Species – organisms that can interbreed • Isolation can cause the formation of new species • Species with more similar sequences are more closely related • You can discover the order in which islands were colonized Example: Bird A: GTCC Bird B: GACC Bird C: GAGC Bird D: GAGG

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