Intro STUFF Flashcards Preview

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Flashcards in Intro STUFF Deck (13):
1

transitional species

can only be identified retrospectively
- bc we know the lineage later evolved

2

evolution of mammals

therapsids to cynodont to mammals

3

morganucadon

early mammalian form
205 mya

4

hadrocodium wui

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

5

developmental biology

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

6

tiktaalik

-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)

7

heterochrony

evolutionary change in timing or rate of developmet

8

paedomorphosis

having juvenile attributes while being a sexually mature adult

9

peramorphosis

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

10

pseudogenes

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

11

biological species

-defined by reproductive isolation
-largest unit of population in which successful reproduction is possible

12

a rooted phylogenetic tree

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

13

fossill record goes back

3,500,000,000 years ago