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1. Paleontological evidence such as fossils provide evidence of evolution over long periods of time as life forms change. 2. Comparative anatomy shows that organisms have homologous organs with the same structure but different functions, indicating common ancestry, as well as analogous organs with different structures but similar functions due to convergent evolution. 3. Biochemical evidence such as similarities in proteins and genes performing the same functions across diverse species also points to common ancestry through evolution.
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Presentation1 (1).pdf
- 1. Evidences for Evolution 1. Paleontological evidences • Fossil are remains of hard parts of life-forms found in rocks. 2. Morphology and comparative anatomy Homologous & Analogous organs • Palaeontology Fossil
- 2. Homologous Organs • Organs having the same structure but different functions. Humerus Radius Ulna • Result of Divergent Evolution • Indicates common ancestry
- 3. Analogous organs • Organs having different structure but have similar appearance and perform similar functions. • Result of Convergent Evolution • Do not indicate common ancestry
- 4. • These are anatomically similar but perform different functions. • These are not anatomically not similar but perform similar functions. Homologous Organs Analogous organs • They are result of divergent evolution. • They are result of convergent evolution. • Indicates common ancestry • Doesn’t indicate common ancestry • E.g.- o Forelimbs of whale, bat, cheetah and human o Thorns of Bougainvillea and tendrils of Cucurbita • E.g.- o Wings of butterfly and birds o Sweet potato and potato
- 5. 3. Biochemical Evidence • The similarities in proteins and genes performing a common given function among diverse organisms give clues to common ancestry. UUU Phenylalanine Bacteria Human
- 7. 1. Darwin’s Finches • Darwin travelled to Galapagos islands and observed many varieties of finches on the same island. • All varieties had evolved from original seed-eating finches. • With alteration in beaks some became insectivorous and some herbivorous. Common Ancestor
- 8. 2. Marsupials of Australia Marsupials Marsupial Pouch Placental mammals • Placenta • Mammary glands
- 9. 3. Placental animals in Australia When more than one adaptive radiation appear to have occurred in an isolated geographical area, and two or more groups of unrelated animals come to resemble each other for similar mode of life or habitat, it is called convergent evolution.