meb Flashcards

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

Speciation

A

the formation of species that increases the range of organisms on earth, increasing biodiversity. Extinction is the loss of species that decreases the range of organisms on earth, decreasing biodiversity

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

Temporal isolation

A

breeding or flowering at different times of the year where different populations or species may produce gametes at different times preventing successful reproduction

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

Behavioural isolation

A

specific courtship behaviours or different pollinators where different populations or species behave differently or utilise different pollinators resulting in mating or pollination not occurring, so no successful reproduction occurs

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

Mechanical/structural isolation

A

incompatible sex organs or chemicals that prevent gametes from individuals of different populations or species from fertilising

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

Ecological isolation

A

occupying different habitats or niches in the same environment decreases the chance of meeting up with a potential mate in different populations or species

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

Hybrid isolation (post-zygotic)

A

when different populations or species do manage to reproduce and produce hybrid offspring, however, the hybrid is infertile and unable to reproduce

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

Punctuated Equilibrium

A

According to punctuated equilibrium, evolution is not always gradual as proposed by Darwinism.

Evolution may involve long periods of time where species do not change or change very little (known as equilibrium).

This alternates with (is punctuated by) short periods of time where rapid changes occur through natural selection and speciation.

As a result, new species are formed in a short period of time, relative to the long periods of no/little change.

This is supported by the absence of transitional fossils (usually termed missing links) indicating the period of rapid change.

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