Biology Unit 5 - Evolution

What is evolution?
The frequency of an allele in a population changes over time
1 of 11
How does evolution occur>
Through natural selection
2 of 11
When does speciation occur?
When populations of the same species become reproductively isolated, reducing gene flow
3 of 11
How many reproductive isolation occur?
Allopatric or sympatric isolation
4 of 11
Why does reproductive isolation occur?
Because the changes in the alleles and phenotypes of the 2 populations prevent them from successfully breeding together
5 of 11
3 types of changes?
Seasonal, mechanical, behavioural
6 of 11
Seasonal changes?
Individuals from same population develop differing flowering/mating seasons
7 of 11
Mechanical changes?
Changes in genitalia that prevent successful mating
8 of 11
Behavioural changes?
Develop courtship rituals that aren't attractive to the main population
9 of 11
What does sympatric isolation not require?
Geographical isolation
10 of 11
What occurs within a population?
Random mutations
11 of 11

Other cards in this set

Card 2

Front

How does evolution occur>

Back

Through natural selection

Card 3

Front

When does speciation occur?

Back

Preview of the front of card 3

Card 4

Front

How many reproductive isolation occur?

Back

Preview of the front of card 4

Card 5

Front

Why does reproductive isolation occur?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Ecology, ecosystems and environmental biology resources »