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Lecture

Chapter 24-Evo through natural selection

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School
Department
Biology
Course
120
Professor
Robertson
Semester
Fall

Description
Evolution through Natural Selection (Chap 24)  Typological all major groups idealized, independent, with no common connections o Aristotle’s ladderproposed that species were organized in a sequence based on ↑ed size and complexity with humans on top  All species exist in populations o Groups of individuals that mate and share common features o Populations evolve individuals don’t  Species are unique o Shared characteristics(homologous traits)  Genetic (DNA sequence, chromosomal)  Developmental homology (embryology)  Structural (vestigial)  Behavioral (fight or flight responses)  Species change over time o Most have gone extinct (over 99%)indicated by the fossil record o Species are related by common ancestry  We can find vestiges in modern lineages( human tailbone and goose bumps) o Whales closely related to hippos  Understanding frequency distribution graph o X-axis tells the amount of variation observed in the trait o Y-axis tells the num
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