14.3 Reproductive Barriers

Question 1

What do reproductive barriers isolate

Answer 1

the gene pools of species

Question 2

How many main types of reproductive barriers are there?

Answer 2

2

Question 3

What are the 2 main types of reproductive barriers?

Answer 3

Prezygotic Barriers and Postzygotic Barriers

Question 4

How many types of Prezygotic Barriers

Answer 4

5

Question 5

What are the 5 types of Prezygotic Barriers

Answer 5

1) Habitat Isolation
2) Temporal Isolation
3) Behavorial Isolation
4) Mechanical Isolation
5) Gametic Isolation

Question 6

Habitat Isolation

Answer 6

if you are in different habitats you cannnot mate and reproduce

Question 7

What is an example of Habitat Isolation?

Answer 7

land snakes cannot mate with water snakes

Question 8

Temporal means

Answer 8

time

Question 9

Temporal Isolation

Answer 9

mating seasons are different so they cannot mate and reproduce

Question 10

What is an example of temporal isolation

Answer 10

lillies mate in the day and chrysthanseum mates in the night

Question 11

Behavorial Isolation

Answer 11

different organisms have different courtship rituals

Question 12

What is an example of behavorial isolation

Answer 12

finches won’t recognize the courtship rituals of the song and dance of a blue footed booby

Question 13

Mechanical Isolation

Answer 13

reproductive parts of organisms are incompatible

Question 14

What is an example of Mechanical Isolation?

Answer 14

Red and purple sea urchins -> one has surface proteins that do not allow the sperm to fuse with the egg

Question 15

Gametic Isolation

Answer 15

molecular incompatibility of the egg and the sperm (doesn’t fuse)

Question 16

What is gametic isolation usually caused by

Answer 16

different chromosomal numbers

Question 17

Post Zygotic Barriers

Answer 17

barriers formed after the egg is fertilized and the zygote is formed

Question 18

How many types of Post Zygotic Barriers are there

Answer 18

3

Question 19

What are the 3 types of Post zygotic barriers

Answer 19

1) Reduced Hybrid viability
2) Reduced hybrid fertility
3) Hybrid Breakdown

Question 20

Reduced Hybrid Viability

Answer 20

the hybrid is developed but the organism is weak and dies before reproductive age

Question 21

What is an organism that proves an example of reduced hybrid viability

Answer 21

some types of salamanders

Question 22

What is reduced hybrid viability caused by

Answer 22

the interaction/incompatibility of parent genes

Question 23

Reduced hybrid fertility

Answer 23

strong organism; cannot reproduce

Question 24

What is an example of an organism that proves reduced hybrid fertility

Answer 24

mule (horse + donkey)

Question 25

Hybrid Breakdown

Answer 25

first hybrids are strong and can reproduce, but the 2nd generation cannot reproduce and is weak

Question 26

What is an example of an organism that proves hybrid breakdown?

Answer 26

rice hybrids

Question 27

What is hybrid breakdown caused by?

Answer 27

difference in the number/structure of chromosomes

Question 28

Hybrid Zones

Answer 28

regions in which members of different species meet and mate, producing at least some hybrid offspring