Section 22.1 (Exam 3)

Question 1

Define species.

Answer 1

Groups of organisms that share a suite of genetic and morphological attributes, and are reproductively isolated from other such groups

Question 2

How are species formed?

Answer 2

speciation

Question 3

Define speciation.

Answer 3

Divergence of biological lineages and emergence of reproductive isolation

Question 4

What are species concepts?

Answer 4

Different ways of defining species

Question 5

What are the two main species concepts?

Answer 5

The morphological and biological species concepts

Question 6

What does the morphological species concept entail?

Answer 6

species are defined by their appearance

Question 7

What is the limitation of the morphological species concept?

Answer 7

Males and females of a species may be different, and immature individuals may not look like their parents

Cryptic species – morphologically the same, but do not interbreed

Question 8

What are cryptic species?

Answer 8

morphologically the same, but do not interbreed

Question 9

What does the biological species concept entail?

Answer 9

groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups

Question 10

What does the Dobzhansky-Muller model entail?

Answer 10

Ancestral population is separated by a barrier

When the two new populations join each other, their resulting offspring is unsuccessful