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15 Cards in this Set
- Front
- Back
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Why do you think this video is called Your Inner Fish? |
It is based on Neil Shubin's book, "Your Inner Fish" which theorizes that every bird, reptile, amphibian and primate descends from fish. |
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What are some things we have in common with fish and how does this give evidence for fish ancestry? |
Fish were the first animals to have a bony skeleton, so we must have gotten skeletons from them. |
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What is one defining piece of human anatomy that seems far removed from fish? How does this have its origin in ancestral fish? |
Hands; fish carry the gene that makes fingers possible. |
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Where did Shubin and Daeschler look for transitional fish? What did D find? |
Red Rocks PA, cutouts in the hill. Found a shoulder girdle of a tetropod called hynerpeton. |
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What did Jenny Clack find in Greenland in the 1980's and what was significant about it? |
Acanthostega. Similar to salamanders, front legs with paddles in the back. |
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What is significant about the Devonian era rock map? What was the challenge in finding fish there and what did they do about it? |
Three areas: Red Rocks PA, Greenland and Northern Canada, the last of which were 10 M years older than the other two. Challenge: too much snow, polar bears, bad weather, no settlements, no roads, no supplies except what you brought in. |
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What was the "needle in the haystack" they looked for in Canadian fossils? |
That a fossil forms at all and then that an archaeologist finds it in the midst of all of that snow and ice. |
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Why were fish embryos significant? Fish ancestry? |
Fish have the body plans that exists in everyone in the embryonic stage. We all have gill arches at one stage of embryonic development that in humans turn into the jaw, middle ear & voice box. |
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How do dropping gonads in human embryos prove fish ancestry? |
Gonads develop in the deep chest in both, but humans are warm blooded so they drop down out of the body to form testicles which is why men are prone to hernias. |
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What did Cliff Tabin discover in studying chicken embryos, and why is it significant? |
Studying how limbs develop from limb buds; patches of cells transferred from one side to the other form mirror image digits. |
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What is the Sonic Hedgehog gene responsible for? |
SH sends out organizing genes, telling genes when to turn on and off to form digits in the hand, the pattern of them. Fingers, paws in mice etc. |
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Why does Kamani have extra digits? |
Through gene mutation, too much Sonic Hedgehog gene, extra digits form, less, fewer digits form. |
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What was the "gold" found in July 2004 in Jason's ancient river bed? Signifcance? |
Tiktaalik, skull attached to body, no doubt that skull belonged to that body; large flat headed, freshwater fish; some fish features, but a fin with 1 bone, 2 bone, blob of bones. |
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What did Tiktaalik use it's neck for? |
To watch out for predators and hunt smaller prey. |
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What are some of the forms the descendants of Tiktaalik evolved in their limbs? |
Early amphibians with 8 fingers Reptiles that would colonize dry land. Primates that swing through trees. The human hand. |
