BIOL 1020 Lecture Notes - Lecture 22: Comparative Anatomy, Selective Breeding, Eustachian Tube
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BIOL 1020 Full Course Notes
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Epigenetics: long-term alterations of dna that don"t involve changes in the. Dna sequence itself: deals with how genes are turned on and off in eukaryotic cells. If you attach an acetyl group to a lysine (amino acid) in a protein it modifies that histone therefore exposing some genes turning them on. These are additive processes: methylation is believed to have environmental influence. This is a possible explanation as to why some genotypes do not express their phenotypes. Schizophrenia (in monozygotic twins there is a 50% chance one twin could get schizophrenia and the other not this is because each twin does not turn on and off the same genes (penetrance is less than 100%) Organic evolution: evolution is a change in a population of organisms with time. Population: a group of interbreeding individuals who share a common geographic area. Darwin is the person who is responsible for the idea of natural selection (the mechanism by which evolution works).
