Quiz #8
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Evolution definition
A change in a species over time
Lamarck
Came up with theory of acquired characteristics
Theory of acquired characteristics
Use/disuse causes traits to change (incorrect)
Charles Darwin
Sailed to the Galapagos in 1831 and developed theory of natural selection (correct - published in 1858)
4 components of the theory of natural selection
• Genetic variation • Overproduction • Competition • Different rates of survival and reproduction
Genetic variation
Traits vary and are inherited
Overproduction
More born than can survive
Competition
Fighting for resources
Different rates of survival and reproduction
Best adapted survive
How does natural selection lead to evolution?
Organisms with favorable traits survive and pass down the trait and eventually the unfavorable trait is no longer there
Speciation definition
Formation of new species
How can speciation occur?
• Geographic isolation • Continental drift
Evidence for evolution
• DNA • Comparative anatomy • Embryology • Fossils
DNA (evidence for evolution)
The more similar the base pairs, the more closely related
Comparative anatomy (evidence for evolution)
• Homologous structures • Similar features inherited from a common ancestor but changed for different functions
Embryology (evidence for evolution)
Embryos are similar
Embryo
Earliest stage of development
Fossils (evidence for evolution)
• Preserved remains/traces of ancient organisms • Can see intermediate forms that support ideas of change from ancient to modern