Chapter 15/16- Evolution Flashcards Preview

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Flashcards in Chapter 15/16- Evolution Deck (32):
1

Natural selection acts upon ___

Phenotypes

2

Evidence of evolution (5)

- homologous structures
- analogous structures
- vestigial structures
- embyologic similarities
- macromolecules

3

Chemosynthetic

Use organic molecules as a source of energy instead of the sun light

4

Convergent evolution

Appear similar but aren't closely related

Similar environments select similar traits

5

Homologous structures

Similar features

Share a common ancestor

6

When the bell curve kinda splits down the middle... Higher in the extreme areas ( n -> m)

Disruptive selection

7

When the bell curve narrows it's ____

Stabilizing selection

8

How many mass extinctions have their been

5

9

Species :

-physically similar
- successfully interbreed

10

Postzygotic isolation

Barrier between interbreeding

11

Embryological similarities

Show genes organisms have in common

12

Genetic drift

Several alleles r lost in the population due to a random event


(Tree falling over/storm)

13

Analogous structure

Similar features

Don't share common ancestors

(Proves that environments select certain abilities)

14

Vestigial structures

Organisms still have

No longer useful

15

When the bell curve shifts to another side

Directional selection

16

Variation

Any difference between organisms

17

Evidence for evolution

-fossils
-biochem
-vesiigial

18

Natural selection ___ evolution

Drives

19

A process called _____ allows new species to be made

Speciation

20

4 steps of Darwinian Natural selection

- Over production
-Variation
-Competition
- reproduction

21

Directional selection

One extreme form of the trait is best

22

Divergent evolution

Related populations or species become less and less like

23

Coevolution

Two or more species in a close association work with one another and change together

-predator/prey

24

Darwin theory

-descent with modification due to natural selection

25

Endosymbiosis

Organisms live inside each other

Ex host sells

26

Smallest unit that can evolve

Population

27

Stabilizing selection

Nature selects the most average trait to be the best


Ex human baby size

28

absolute age

Radioactive dating

29

Lamarck hypothesis

Inheritance of acquired traits

Ex. U run build a ton of muscle-> ur offspring already has a ton of muscle

30

Disruptive selection

Average is the worst to have

31

Relative age

Will be based on its position in the rocks layers

Ex Grand Canyon

32

3 steps of speciation

-geographic isolation
-separate evolutionary adaptives
- reproductive isolation