Oct 21 Flashcards Preview

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Flashcards in Oct 21 Deck (30):
1

TRUE/FALSE
Low relative genetic diversity is a consequence of the founder effect in peripatric speciation

TRUE

2

When in the F1 offspring of two different animal
races one sex is absent, rare, or sterile, that sex
is...

heterogametic sex

3

Which sex is usually sterile?

heterogametic sex

4

What are aneuploid gametes?

have incorrect number of chromosomes

5

What are hybrid zones?

Where different species meet and mate, resulting in some offspring

6

What is a primary hybrid zone?

where the change in allelic frequencies occurs (often at a geographic or trophic change); divergence is taking place between adjacent populations of a previously homogeneous species

7

What is a secondary hybrid zone?

when allopatrically distinct species have expanded and then meet

8

Genetic, morphological and other phenotypes
can act as ___ of different species

markers

9

A normal distribution of markers in the offspring of individuals implies what?

random mating

10

A nonnormal distribution of markers in the offspring of individuals implies what?

nonrandom mating-->species

11

How can mismatch btw genes affecting mating compound reproductive isolation?

problems w/ sexual communication

12

What is the relationship btw genetic distance and degree of reproductive barriers?

positive

13

What does coalescence theory argue?

all genes in a population originate from a
common ancestor

14

TRUE/FALSE
recent speciation=rapid coalescence

TRUE

15

What is ecological selection?

adaptive divergence and subsequent reproductive isolation

15

What is ecological selection?

adaptive divergence and subsequent reproductive isolation

16

What are 3 consequences of speciation?

1) niche partitioning
2) diversity
3) robustness

16

Magic traits result from what?

ecological selection

17

Ecological/sexual selection lead to (fast/slow) speciation

fast

18

There is higher species diversity in (promiscuous/monogamous) birds

promiscuous

19

Why does promiscuity drive speciation?

prevents hybridization

20

(Allopatric/sympatric) species have lower ‘threat’ of hybridization

Allopatric

21

What is introgression?

genes with neutral effects can be exchanged
between recently speciated populations

22

What is linkage disequilibrium?

genes inherited non-randomly ie. linked genes

23

Introgression yielding non-sterile hybrids (increase/decrease) linkage disequilibrium via recombination

decrease

24

What is an example of speciation w/ gene flow?

introgression

25

What are 2 factors that can reinforce reproductive isolation?

allopatric populations
ecological selection/magic trait

26

What is an example of speciation w/ gene flow?

introgression

27

What are 2 factors that can reinforce reproductive isolation?

allopatric populations
ecological selection/magic trait

28

Animal based pollen dispersal drives (fast/slow) speciation

fast