Intro STUFF Flashcards

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1
Q

transitional species

A

can only be identified retrospectively

- bc we know the lineage later evolved

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2
Q

evolution of mammals

A

therapsids to cynodont to mammals

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3
Q

morganucadon

A

early mammalian form

205 mya

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4
Q

hadrocodium wui

A

195 mya

derived ear structure: separation of middle ear bones from the jaw.

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5
Q

developmental biology

A

important tool for reconstructing paths of change and understanding a genetic change that leads to a change in phenotype
-tells us about homologous characters

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6
Q

tiktaalik

A
  • another morphological bridge between lobe-finned fishes and tetrapods
  • gills, scales, and fins like a fish but flat head and eyes. nostrils on top and a neck
  • limb bones (with wrists)
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7
Q

heterochrony

A

evolutionary change in timing or rate of developmet

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8
Q

paedomorphosis

A

having juvenile attributes while being a sexually mature adult

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9
Q

peramorphosis

A

phylogenetic change in which individuals of a species mature past adulthood and take on hitherto unseen traits.

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10
Q

pseudogenes

A

organisms retain genes for making structures no longer found in their lineage

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11
Q

biological species

A
  • defined by reproductive isolation

- largest unit of population in which successful reproduction is possible

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12
Q

a rooted phylogenetic tree

A

base is located at the common ancestor of all taxa depicted on that tree.

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13
Q

fossill record goes back

A

3,500,000,000 years ago

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