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Unformatted text preview: Bio anthro lecture 2 16:08 Evolution- changes in gene frequency over time (across generations) • Process (not progress) • Time scalp=generation (parent-offspring) Envirotmental change – evolve OR go extinct Evolution act on heritable traits • Traits with genetic basis o Blood type? Yes o Body builder’s body? No o Disease? Some Lamarkian evolution- acquired changes passed to offspring Heritable traits- • inheritec by individuals • evolution measured over generations why gene frequences change? Environmental pressure Charles Darwin- evolution by naturl selection Natural selection- survila of the fittests • differential repuroductive success-changes in gene frequency from generations evolution acts on phenotypes (individuals) • phenotype=genotype+enviroment • phenotype=genotype (affects future gene frequency) + enviroment (slects for fittest phenotypes) • mechanism natural selection • resembles aftificla selcion • phenotype variation reflects genotypic variation • Charles Darwin and Alfred Russel Wallace-...
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- Fall '08
- gene frequency, Zygotes, Darwin, o Crossing