Bio Midterm 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Env of early tetrapods | -same time animals were "invading the land"
-mainly gymnosperms (water dependent)
-swamp habitats and very food rich
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| evolution of tetrapods | -lungfish with fins were ancestors
-pectoral and pelvic find homologous to fore- & hind- limbs
-lungfish are sister group to tetrapods bc dna evidence
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| tiktaalik and acanthostega | -found in cold regions
-lived in tropical warm climates
-fossils moved with tectonic plates
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| genius tiktaalik | -around 375 m.y.a
-"fishpod"
-between fish & tetrapod (characteristics of both groups)
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| tiktaalik trais | 1. primitive neck
-allowed head movement
2. forelimb bones
3. had pelvic girdle but not good
4. had ribs
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| genius acanthostega | -lived around 360 mya
-mainly aquatic but first tetrapod
-well developed pelvic and pectoral girdles
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| acanthostega habitat | -benthic organism on bottom of pools
-able to come on land and crawl
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| traits of acanthostega | 1. well developed muscular laterally compressed tail
2. well-developed gills
3. relatively well developed legs (weight bearing)
4. had toes
5. weak ribs and small lungs
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| Exaptation | -an organism possesses a trait that was used for one purpose, but happened to be useful for other purposes
-suggests teleology but NO!
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| exaltation examples | 1. evolution of tetrapods (legs evolved first before tetrapods moved to land)
2. feathers(originally used for insulation but now used for flight
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| homologous | -similar position, structure, and evolutionary origin, but not same function
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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