Study Guide: Exam 1 Ch. 17

Question 1

The classification of organisms based on their appearance is an application of _______ species
concept.

Answer 1

morphological

Question 2

Even trained biologists have difficulty telling females of Drosophila melanogaster and D. sechellia
apart, and yet these species are reproductively isolated. Thus, these species are considered _______
species.

Answer 2

cryptic

Question 3

Who came up with the binomial system of nomenclature?

Answer 3

Carolus Linnaeus

Question 4

The _______ species concept holds that “species are groups of actually or potentially interbreeding
natural populations that are reproductively isolated from other such groups.”

Answer 4

biological

Question 5

The evolution of chromosomal rearrangements in Rhogeessa bats supports the role of _______ in
speciation.

Answer 5

Dobzhansky–Muller Model; Prezygotic; Genetic incompalibility

Question 6

Which one is more common, sympatric or allopatric speciation?

Answer 6

Allopatric speciation is thought to be the dominant mode of speciation in most groups of organisms.

Question 7

What is allopatric speciation?

Answer 7

allopatric speciation: that results when a population is divided by a physical barrier is known as allopatric speciation (Greek allos, “other,” + patria, “homeland”).

Question 8

What is sympatric speciation?

Answer 8

sympatric speciation: Speciation without physical isolation is called sympatric speciation (Greek sym, “together with”).

Question 9

Two species of monkeyflowers have diverged in the structure of their flowers such that they can no
longer be effectively pollinated by the same pollinator species. This is an example of _______
isolation.

Answer 9

reproductive