BIO 2 MECHANISM OF SPECIATION

Question 1

a process by which two species that could otherwise produce hybrid offspring are prevented from doing so.

Answer 1

ISOLATION

Question 2

-Are mechanisms that prevent closely related species from interbreeding.
-Stops two species from producing viable, fertile offspring.

Answer 2

Reproductive Barriers

Question 3

Also known as pre - reproductive barrier
prevent mating between two closely related species.

Answer 3

Prezygotic Barrier

Question 4

Also known as pre - reproductive barrier
prevent mating between two closely related species.

Answer 4

Prezygotic Barrier

Question 5

Physical barrier separate ancestral species.
New species appear in different areas.

Answer 5

Geographic Isolation

Question 6

Species occur in same region, but occupy different habitats so they rarely encounter each other

Answer 6

Ecological isolation

Question 7

Two closely related species reproduce at different times of the day, season, or year.

Answer 7

Temporal “time” isolation

Question 8

Unique behavioral patterns & rituals isolate species.
-identifies members of species.
-attract mates of same species.

Answer 8

Behavioral isolation/ Ethological isolation

Question 9

Morphological differences can prevent successful mating
differences in their reproductive organs prevent interbreeding

Answer 9

Mechanical isolation

Question 10

-A mechanism of reproductive isolation which inhibits mating between two distinct species, by ensuring that their gametes don’t interact with each other.
-Sperm of one species may not be able to fertilize eggs of another species

Answer 10

Gametic isolation

Question 11

Sperm cannot penetrate egg because of receptor recognition malfunction or lock & key between egg & sperm is disrupted.

Answer 11

Biochemical barrier

Question 12

Sperm cannot survive in female reproductive tract.

Answer 12

Chemical Incompatibility

Question 13

Prevent hybrid offspring from developing into a viable, fertile adult.

Answer 13

Postzygotic barriers

Question 14

Chromosomes of parents differ in number or structure thus meiosis in hybrids will fail to produce a normal gametes

Answer 14

Hybrid sterility

Question 15

Genes of different parents can impair or stop the development of the hybrid.

Answer 15

Hybrid viability

Question 16

First generation of hybrids are fertile and viable
Succeeding generations are sterile.

Answer 16

Hybrid Breakdown

Question 17

-Geographical barrier
-Separate two large populations.

Answer 17

Allopatric

Question 18

Geographical barrier
Separate a small number of species from the whole population.

Answer 18

Peripatric

Question 19

No geographical barrier
Leave in the same habitat
the evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region.

Answer 19

Sympatric

Question 20

No geographical barrier
Leave within the same habitat.
Slight difference in the habitat, new niche.
a species is spread out over a large geographic area

Answer 20

Parapatric

Question 21

the inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers or differences. then what is this

Answer 21

prezygotic isolation

Question 22

speciation that occurs when two groups of the same species live in the same geographic location, but they evolve differently until they can no longer interbreed and are considered different species.

Answer 22

sympatric speciation

Question 23

is a form of reproductive isolation, wherein habitat preferences of species lowers the probability of mating.

Answer 23

ecological isolation

Question 24

a process by which two species that could otherwise produce hybrid offspring are prevented from doing so.

Answer 24

reproductive isolation