Speciation Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Define Species

A

A group of similar organisms that can reproduce to produce fertile offspring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Define Speciation.

A

When a new species is formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When does speciation happen?

A

It happens when 2 populations become reproductively isolated.
This means that the 2 groups can’t reproduce to form fertile offspring.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Define Geographical Isolation.

A

A physical barrier that divides a population of species e.g. floods

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define Random Mutations.

A

they happen all the time completely random, not caused by anything

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define Allopatric Isolation

A

When a new species are formed due to geographical isolation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Define Sympatric Isolation.

A

When new species are formed due to reproductive isolation even though that are living in the same area. (due to random mutations that make them no longer compatible.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How does Geographical Isolation happen?

A

1) Conditions on either side of the barrier will be slightly different (with different selection pressures)
2) Therefore, the groups on either side will evolve by natural selection, and different alleles will increase in frequency depending on which are advantageous
3) Eventually the 2 groups are soo genetically different that even if they physically meet they can’t reproduce to produce fertile offspring and are therefore reproductively isolated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly