evolution : it’s all about mutations that aid survival and reproductive selection
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Evolution : it’s all about mutations that aid survival and reproductive selection. Darwin and his evidences for evolution. Darwin’s Evidences of evolution (15-3). First, review key ideas/terms: Struggle for existence Survival of the fittest Fitness Adaptation Natural selection - PowerPoint PPT PresentationTRANSCRIPT
Evolution: it’s all about mutations that aid survival and reproductive selection
Darwin and his evidences for evolution
Darwin’s Evidences of evolution (15-3)
• First, review key ideas/terms:– Struggle for existence– Survival of the fittest• Fitness• Adaptation• Natural selection
– Descent with modification
Evidence #1 (of 4)
The fossil record shows transitional forms of organism– Deeper you go down, older the organism is– Ex.: ?
Evidence #2 (of 4)
The geographic distribution of living species shows descent with modification of organisms– Organisms with different ancestors look/behave
similarly if from similar environment– Ex.: ?
Evidence #3 (of 4)
Homologous structures show similarities in body parts with very different uses– Ex.: ?
– Some structures may no longer have function, called vestigial organs
– Ex.: ?
Evidence #4 (of 4)
Similarities in early development shows how we all come from the same embryonic cells, in the same pattern– What does this imply?– Ex.: