Biology 2581B Lecture Notes - Lecture 15: Mycoplasma, Cladocera, Polyploid
24 Apr 2017
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Lecture 15 genes & gene expression ii. Sequenced ancient dna: woolly mammoth lived in northern regions and they are preserved in ice can extract good dna from tissues and sequence genomes. Woolly mammoth disappeared 45 000 years ago, but a few populations persisted until 4300 years ago: remaining population of mammoths before they went extinct. 4,300 stuck on wrangel island (more recent) This has a big impact for evolution mutations behave different depending on the. Living in siberia in the main land: living in a big population. Living in wrangel island: geographic constrains = small population population size. Implications for mutation: genome is bombarded with mutations all the time. In a big population, most of the bad mutations get purged out (many competitors) If you have a mutation that makes you suck a little bit, it is amplified how much you suck because many people are better than you: most of them are bad rarely good.
