9.3 Macroevolution & Speciation

Question 1

Changes in allele frequencies can lead to the formation of new species. This is called:

Answer 1

Speciation

Question 2

A macroevolutionary change is:

Answer 2

When a population changes enough to be considered a new species

Question 3

Genetically Isolated species are:

Answer 3

Species that have no gene flow

Question 4

What are isolating mechanisms?

Answer 4

Isolation mechanisms maintain, and prevent, the seperation of interbreeding between species.

Question 5

What are three modes of speciation?

Answer 5

Allopatric - geographical divide of a population
Parapatric - reproductive isolation from one another while continuing to exchange genes.
Sympatric - Evolution of new species occurs in the same geographic area – reproductively isolated

Question 6

Divergent Species are:

Answer 6

The creation of species from a common ancestral species.

Question 7

Convergent Evolution ?

Answer 7

The evolution of similiar features through natural selection over time. Evolved from different ancestral structures (they do not share a common ancestor)

Question 8

Coevolution?

Answer 8

When species that interact closely with eachother evolve in response to interaction, or due to shared selection pressures.