Unit 4 9D: Emergence of a new species

Question 1

Fertile

Answer 1

able to reproduce

Question 2

Viable

Answer 2

Able to survive

Question 3

Speciation

Answer 3

The evolutionary process of forming a new species from a pre-existing ancestral species

Question 4

Reproductive isolation

Answer 4

The inability of two groups of organisms to interbreed successfully; genetic isolation also ensures there is no gene flow between the two populations

Question 5

Allopatric speciation

Answer 5

A form of speciation that occurs when a geographical barrier physically divides a population; the two sub-populations accumulate so many genetic differences that they become reproductively isolated and are considered different species

Question 6

Sympatric speciation

Answer 6

A form of speciation that occurs without the involvement of a physical barrier; often occurs in plants as a consequence of polyploidy

Question 7

Divergent Evolution

Answer 7

Where two or more species form from a single ancestral species over time

Question 8

Adaptive radiation

Answer 8

The rapid diversification of a large number of related species from a single ancestral species