EEB211_Lecture3_Selection notes

EEB211_Lecture3_Selection notes - Lecture 3 Selection...

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Note: Variation + Heritability + Excess offspring Selection Evolution The solutions look very similar (with same evolution patterns etc…) Distinction between individuals and populations: individuals don’t change, but populations on a whole (generations evolve). People tend to assume/see patterns (such as increase in size) but this is not always the case some become smaller Good example of this is the Eohippus horse evolving up to an Equus horse. There are some advantages in being larger (longer without drinking water herbivores, overshadows prey, moving faster, etc…) But several larger (largest animals) are now extinct (e.g. dinosaurs, mammoths, etc ) There are also species that evolve and become smaller (there may be advantages in being smaller less food, needed and less competition for survival) Creodonts were carnivorous animals with hooves (normally they have claws for tearing and killing) They had several diagnostic features such as hooves, 100% triangular teeth, yet they existed in carnivorous niche. They became extinct, but their ancestors lived on as herbivores with larger hooves (initially their hooves were tiny). Most groups extinct, one group became grazers, the last became aquatic animals (this is an example of evolution that resulted in the transformation into a form better suited for survival) There is no group selection; selection depends solely on the individual. But (find exception) Classic example of selection (appendix and cecum) appendix is completely useless although it used to be a part of the cecum, but is no longer needed as humans are no longer herbivores.
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