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Unformatted text preview: father) sometimes the two alleles are the same (BB or bb) sometimes they are different (Bb) We can measure the frequency of B and b Take home message #2: evolution is a change in allele frequencies within a population Charles Darwin Unexpected patterns Darwin observed 1. finch variation 2. similarity between fossils of extinct species and the living species in an area struggle for existence--? Organisms better suited to an environment have a greater prob. Of surviving the struggle and will leave mor4e offspring. Through evolution, orgs. May become better matched with their environment Natural selection occurs if there is: Variation Heritable Differential reproductive success .q: why is survival of the fittest a misnomer what is adaptation? A feature *that helps you live and reproduce better) A process *by which organisms become better able to live and reproduce in their environment )...
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- Fall '07