Evolution - SCI Notes 2/22 Laposata Evolution What is...

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SCI Notes 2/22 Laposata Evolution What is Evolution? o It’s all about the genes… o The goal of ALL organisms: To get your genes to the next generation Survive to sexual maturity Secure food Avoid predators Reproduce as much as possible Produce virile, successful offspring Help your kin The importance of genes o Gene Variants: Most genes have variants with different DNA sequence Different gene sequences = Different traits Skin Color Baldness I.Q. Hair Color Metabolism Etc. o Gene Pool
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The “pool” of genetic material in a population Genes have varying frequencies (proportions) within the gene pool What causes changes in gene frequencies? o Mutation Source of genetic variation (new genes) Can be natural or induced DNA sequence changes, creating new gene o Migration Movement of individuals (and their genes) between populations Changes gene frequencies (genes enter/leave) Homogenizes pop.’s (EX: Humans) o Natural selection Explains adaptations of organisms and the origin of species Charles Darwin: 1831-1836: Naturalist on HMS Beagle 1884: Writes essay on origin of species 1858: Natural selection independently proposed by Alfred Wallace; paper jointly presented 1859: The Origin of Species published o What is “fitness”
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Evolution - SCI Notes 2/22 Laposata Evolution What is...

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