Evolution Lecture 1. (1)

Evolution Lecture 1. (1) - What is this course about?...

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What is this course about? Mission: to figure out how all life evolves What is evolution? - evolution is a fact in the same way that gravity is: it can be directly observed and tested. - What does evolution mean? Etymology: “rolling out” or “unfolding” o General usage: any kind of change, usually gradual or progressive o Biological usage: not the same! o Biological evolution is an inherited change in a group of organisms through time . Inherited: Evolution involves the transmission of information across generations (not within one generation, has to be across generations) Group: there is no such thing as an individual “evolving” Time: evolution is a process occurring over generations - What do we want to know about evolution? o We want to know everything about how and why life is the way it is! Questions: how and why do species change in time? How and why does biodiversity change in time? Why are organisms often so well fit to their environment? Stickleback morphology over 110000 yrs. Graphs show some aspect of morphology (body configuration) over time. There was some time where nothing happened, then it happened very quickly. More than half of all known species are insects. o Why are organisms often so well fit to their environment?? Camouflage is a phenomenon that evolution has to show us. - Evolution in action o The HIV epidemic HIV: Human immunodeficiency virus- virus that produces AIDS: Acquired Immunodeficiency syndrome Incidence of aids: there are low prevalence levels in the new world,
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Evolution Lecture 1. (1) - What is this course about?...

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