Quiz 7 Flashcards Preview

Evolution > Quiz 7 > Flashcards

Flashcards in Quiz 7 Deck (26)
Loading flashcards...
1

What is the definition of a species? (3 parts)

a group that
1. is distinct in appearance, behavior, and habitat
2. interbreeds
3. and is evolutionarily independent

2

What happens when gene flow is not occurring?

the two populations become isolated

3

What does isolation allow independent evolution through? (3 things)

1. Natural selection
2. Genetic drift
3. Mutation

4

What is the definition of speciation?

the creation two or more distinct species from a single ancestral group

5

What are the three methods of new species identification?

1. biological
2. morphospecies
3. phylogenetic

6

What are distinct species defined by?

reproductive isolation

7

What are the 5 mechanisms of the biological species concept?

1. temporal
2. habitat
3. behavioral
4. gametic
5. mechanical

8

What are the two mechanisms of postzygotic production?

hybrid viability
hybrid sterility

9

What are 3 disadvantages of the biological species concept?

1. not useful with fossils
2. not useful with asexual organisms
3. not useful with related species that are isolated

10

what is the morphospecies concept based off of?

distinguishing features that arise when populations are isolated from gene flow

11

What is the phylogenic species concept based off of?

common ancestory

12

What is the phylogenic species concept based off of?

common ancestory

13

What does allopatry mean?

groups of same species in different geographic areas

14

What are the two types of allopatry?

dispersal
vicariance

15

What is dispersal allopatry?

moving to a new habitat

16

What is vicariance allopatry?

physical splitting of a habitat

17

What does sympatry mean?

groups of same species in the same geographic area

18

What does sympatry mean?

groups of same species in the same geographic area

19

What is pre zygotic isolation?

when divergence has occurred and has effected when, where, or how individuals mate

20

What is population fusion?

when two populations interbreed and they lose distinguishing features

21

What is reinforcement?

differences between species persist and they remain divergent

22

What are the 3 types of hybridization?

zone formation, extinction, and speciation

23

What is population fusion?

when two populations interbreed and lose distinguishing features

24

What happens when hybrid offspring has a lower fitness than the parents?

the offspring die

25

What happens when hybrid offspring has an intermediate fitness than the parents?

the offspring survive

26

what happens when the hybrid offspring has a higher fitness than the parents?

the offspring survives and thrives