Stnd: 8 e C-Notes: Evidence of Evolution

Transcription

1 Stnd: 8 e C-Notes: Evidence of Evolution 3/10/2014 Objective: SWBAT analyze different types of evidence of evolution with regard to diversity of different organisms.

2 What evidence supports evolution? 1. Comparative Anatomy (Similar body structures) 2. Comparative Embryology (Patterns of early fetal development) 3. Comparative DNA/Molecular Biology (Similarities in DNA) 4. Fossils **Conclusion: Things changed overtime and we all came from a Common Ancestor.**

3 What is comparative anatomy? The study of the similarities and differences between the physical traits (genes) of different organisms. The more similar the anatomy, the more closely related the organisms are. Two Types: 1. Homologous structure 2. Vestigial Structure

4 How does comparative anatomy provide evidence that we evolved from a common ancestor? Vertebrates all have similar bones, just shaped for their specific niches(habitat), which provides evidence that we are all related.

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7 What are homologous structures? What is ANALOGOUS Structures? Similar structures of the related species but different functions. different shape but used for same thing

8 Comparative Morphology = study of the forms/shapes of organisms. HOMOLOGOUS Structures = same shape but different functions.

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11 Comparative Morphology = study of the forms/shapes of organisms. ANALOGOUS Structures = different shape but used for same thing.

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13 What are Vestigial Structures? Body part structures that you no longer use Ex: wisdom teeth and appendix in humans. Whales hip bones is no longer attached to the spine or leg

14 How does vestigial structure provide evidence that we evolved from a common ancestor? Shows the remainder of a body part that hasn t completely been dissolved away If it has no function, why is it there? Because it came from the common ancestor.

15 Vestigial organs = organs that are still present but are no longer useful. Hind leg bones on whale fossils Why would whales have pelvis & leg bones if they were always sea creatures?

16 Pelvis bone

17 What is Comparative Embryology (development)? Comparing how different species develop before birth. The more similar the development; the more closely related the organisms are Ex: Each develop a * tail *bud that becomes a limbs *pharyngeal pouches which contain gills

18 Comparative embryology = Development of embryo tells an evolutionary story Human Fish Calf Salamander Hog Tortoise Rabbit chicken similar structures during development Development of embryo tells an evolutionary story

19 They are later removed or develop into other structures.

20 How does comparative embryology provide evidence that we evolved from a common ancestor? Shows that many organisms develop in a similar way, showing more evidence that we are related

21 What is Comparative DNA (Molecular Biology)? Comparing genes of different species to determine how closely related they are. The more similar the DNA sequences; the more closely related the organisms are *Count the # of amino acids differences between the organisms. *The less differences the more closely related they are. (ex: DNA, protein, etc.)

22 Which animal is more closely related to humans? How can you tell? Animal Species Amino Acid (Protein) Difference Gorilla 1 Monkey 8 Mouse 27 Chicken 45 Frog 67 Lamprey 125

23 How does comparative DNA provide evidence that we evolved from a common ancestor? The more similar the DNA sequences; the more closely related the organisms are

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26 What are fossil records? The remains or imprints of once-living organism found in layers of rock. (types of animal, location, age, etc) They provide clues to Earth s past

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28 Fossils = preserved remains of an organism that lived many years ago. lboeckl.net IDA: Revealing the Link lovingthebigisland.wordpress.com ngphotooftheday.blogspot.com graphics8.nytimes.com images.icnetwork.co.uk

29 What do we learn from fossils? Provides clues about how and when new species appeared, evolved, and became extinct. Look at similarities and differences in anatomy Shows earlier forms of certain animals and transitional fossils. Look at similarities and differences in anatomy

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32 Whale Evolution Link between hoofed mammals and Whales 60 million years ago Spent little time on land, small hind legs useless for walking 40 Million years ago Could walk like a sea lion But also swam 50 Million years ago Modern Whales have front flippers and small internal hind leg bones that do not have a function

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42 What is gradualism? Idea that evolution occurs slowly but steadily

43 What is punctuated equilibria? Idea that evolution occurs quickly and is followed by long periods of little to no change. Explains gaps in fossil record.

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