Chap.24 Speciation Continued

Question 0

Biological species concept is based on

Answer 0

The ability to interbreed and reproduce viable offspring

Question 1

Four consents of species

Answer 1

Biological
Morphological
Ecological
Phylogenetic

Question 2

Morphological concept is

Answer 2

Based on body shape and other structural features

Question 3

Ecological concept of species is

Answer 3

Based on members of a species interact with there environment and the specific niche

Question 4

The phylogenetic concept of a species is defined as

Answer 4

Smallest group of individuals that share common ancestors on the tree.

Question 5

Tow types of speciation barriers

Answer 5

Prezygotic

Postzygotic

Question 6

Prezygotic

Answer 6

Before sperm fertilizes an egg

Question 7

Postzygotic

Answer 7

After fertilization of the egg

Question 8

5 types of Prezygotic barriers

Answer 8

Ecological (habitat) 
Temporal (timing ) 
Ethological (behavioral) 
Mechanical 
Gametic

Question 9

3 post zygotes barriers

Answer 9

Reduced hybrid viability
Reduced hybrid fertility
Hybrid breakdown

Question 10

Hybrid breakdown

Answer 10

Consequent generations of individuals are feeble or sterile

Question 11

reduced hybrid viability

Answer 11

Hybrid development or serial is impaired

Question 12

• Provides linkage between evolutionary change within individuals
• Is a process
• requires disruption of gene flow

Answer 12

Speciation

Question 13

RIM’s

Answer 13

Reproductive Isolating Mechanisms

Question 14

Barrier to gene flow
Accumulation of mutation, genetic drift, natural selection
Genetic divergence and reproductive barriers
Possible secondary contact and hybridization

Answer 14

Class view of speciation

Question 15

Two types of speciation

Answer 15

Allopatric

Sympatric

Question 16

Allopatric

Answer 16

( other country)

Divided by geographical barriers into subpopulations that undergo genetic change individually

Question 17

Sympatric

Answer 17

(same country)

Live in same geographic location but occupy different habitats

Question 18

Hybrid zones

Answer 18

Region in which members of different species mate and produce hybrids

Question 19

Hybrids

Answer 19

Result of mating two different species

Question 20

Primary hybrid zone

Answer 20

Bounds of two populations that interbreed

Question 21

Secondary hybrid zone

Answer 21

Formed when allopatric populations become genetically different then meet again and interbreed ( second contact )

Question 22

3 outcomes of hybrid zones

Answer 22

Reinforcement
Fusion
Stability

Question 23

Reinforcement hybrid zones

Answer 23

Straighten reproductive barriers ( weak hybrids)

Question 24

Fusion hybrid zones

Answer 24

Weakens reproductive barriers (strong hybrids )

Question 25

Stability hybrid zones

Answer 25

Continued formation of hybrids ( ok hybrids)

Question 26

Outcomes of secondary hybrid zones

Answer 26

No hybrids (no zone) Narrow zone Wider zone Reunification of gene pool