Adaptive Radiations Flashcards

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1
Q

Adaptive Radiations

A

Evolution occurs on a continuum from gradual to rapid, cause fossil record to mostly show long periods of little change interrupted by explosions of new species

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2
Q

Niches

A

Way organism uses its environment

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3
Q

Heterochrony

A

Adaptive radiations are facilitated by polyploidy or rate of development

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4
Q

Example of Heterochrony

A

Human and chimp brain sizes are different because skull growth is turned off at different times

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5
Q

How many mass extinctions are there in fossil record?

A

Five

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6
Q

Two most famous mass extinctions

A

Permian and Cretaceous

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7
Q

Permian ME

A

250 mya, 90+% of species on land and sea lost, occurred during time of Pangea

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8
Q

How long did it take life to recover after Permian?

A

5+ million years because of extreme temperatures, no life existed except for on the poles

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9
Q

How hot was land after Permian?

A

120-140 degrees F

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10
Q

How hot was water after Permian?

A

105 degrees F

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11
Q

Cretaceous ME

A

65 mya about 3/4 of all species were lost (including the dinosaurs) because of chixilub

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12
Q

Following Cretaceous ME

A

Mammals underwent a major adaptive radiation

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