Biology Notes 1-16-08

Biology Notes 1-16-08 - Biology Notes January 16, 2008 What...

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Biology Notes January 16, 2008 What is evolution? A change in species over time. What is required? Change in environment heritable genetic variation large populations (outcrossing) time geography mating (random, inbreeding) -bottleneck effect - small population = one certain trait being passed on or eliminated. Evolution can be described as descent with modification -descent gives you similarities What is actually required? 1. inheritance (time is implicitly described here) 2. variation 3. origin of new variation (mutation) What is natural selection? The process whereby the trait distribution of all the offspring in a population differs from that of all the parents. What is required for natural selection? Inheritance (via reproduction) Mortality Variation Fitness differences among animals What is actually required for natural selection? 1. inheritance 2. variation 3. fitness differences among individuals Evolution by natural selection results in adaptations
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Biology Notes 1-16-08 - Biology Notes January 16, 2008 What...

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