Speciation

Question 1

is often defined as a group of
organisms that can reproduce naturally with one another and create fertile offspring.

Answer 1

species

Question 2

is a lineage-splitting event that
produces two or more separate species.

Answer 2

speciation

Question 3

Occurs when a group within a species separates from other members of its species
and develops its own unique characteristics.

Answer 3

speciation

Question 4

the process by which one genetically cohesive population splits into two or more reproductively-isolated populations

Answer 4

speciation

Question 5

Requires the disruption of gene flow and the evolution of reproductive isolating mechanisms (RIMs).

Answer 5

Speciation

Question 6

involves barriers to reproduction

Answer 6

Speciation

Question 7

3 Types of Speciation

Answer 7

Allopatric Speciation
Parapatric Speciation
Sympatric Speciation

Question 8

speciation by geographic isolation

Answer 8

Allopatric Speciation

Question 9

something extrinsic to the organisms prevents
two or more groups from mating with each other regularly, eventually causing that
lineage to speciate.

Answer 9

Allopatric Speciation

Question 10

there is no specific extrinsic barrier to gene flow.

Answer 10

Parapatric Speciation

Question 11

population is continuous, but nonetheless, the
population does not mate randomly.

Answer 11

Parapatric Speciation

Question 12

Individuals are more likely to mate with their geographic neighbors than with individuals in
a different part of the population’s range.

Answer 12

Parapatric Speciation

Question 13

Instead of being separated by a physical barrier, the
species are separated by differences in the same
environment.

Answer 13

Parapatric Speciation

Question 14

sometimes happens when part of
an environment has been polluted.

Answer 14

Parapatric Speciation

Question 15

occurs when there are no physical
barriers preventing any members of a species from mating with another, and all members are in close proximity to one another.

Answer 15

Sympatric Speciation

Question 16

A new species, perhaps based
on a different food source or characteristic, seems to
develop spontaneously.

Answer 16

Sympatric Speciation

Question 17

occurs when geographic isolation creates a reproductive barrier.

Answer 17

Allopatric Speciation

Question 18

occurs when a reproductive barrier is created by something other than geographic isolation

Answer 18

Sympatric Speciation

Question 19

involve changes to organisms that prevent interbreeding.

Answer 19

Intrinsic mechanism

Question 20

We may be observing the first steps of parapatric speciation in the grass species_______ (at right)

Answer 20

Anthoxanthum odoratum