Question 1

Compare and contrast allopatric and sympatric speciation.

Accepted Answer

The answer of Compare and contrast allopatric and sympatric speciation....

Question 2

The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of reproductive isolating mechanism?

Accepted Answer

A)  behavioral isolation 
B)  mechanical isolation 
C)  gametic isolation 
D)  temporal isolation 
E)  hybrid breakdown

Question 3

Habitat changes for cichlids living in Lake Victoria are causing a change in:

Accepted Answer

A)  mate choice. 
B)  species diversity. 
C)  coloration of male cichlids. 
D)  frequency of hybrids. 
E)  All of these.

Question 4

If a small population of mice colonizes a new area away from the range of the original species, the colony that is geographically isolated may eventually evolve into a new species.These events can be used to describe:

Accepted Answer

A)  allopatric speciation. 
B)  hybridization. 
C)  allopolyploidy. 
D)  adaptive radiation. 
E)  sympatric speciation.

Question 5

Examples of "new" features, which include wings on insects, flowers on plants, and feathers on birds, are referred to as:

Accepted Answer

A)  preadaptations. 
B)  allometric growth. 
C)  allopolyploidy. 
D)  paedomorphosis. 
E)  punctuated equilibrium.

Question 6

Which model would predict that populations diverge from one another through the slow accumulation of adaptive changes within each population?

Accepted Answer

A)  punctuated equilibrium 
B)  paedomorphosis 
C)  hybridization 
D)  gradualism 
E)  allopolyploidy

Question 7

The __________ species concept defines a species as a population whose members do not interbreed in nature.

Accepted Answer

A)  genetic 
B)  ecological 
C)  morphological 
D)  biological 
E)  evolutionary

Question 8

MATCHING
Match the following terms with their description
a.accounts for the abrupt appearance of new species in the fossil record in absence of transitional fosssils
d.contains multiple sets of chromosomes from 2 or more species
b.species with a inheritable unique diagnostic trait
e.the possession of more than 2 genomes
c.speciation results from their divergence in genetic composition
-polyploidy

Accepted Answer

The answer of MATCHING
Match the following terms with their description
a.accounts...

Question 9

Identify three reproductive isolating mechanisms and briefly outline how each may contribute to the formation of new species.

Accepted Answer

The answer of Identify three reproductive isolating mechanisms and briefly...

Question 10

Which of the following is not a problem in applying the biological definition of species?

Accepted Answer

A)  asexually reproductive organism 
B)  greenhouse hybrids 
C)  reproductive isolation from other species 
D)  self-fertilization 
E)  extinct organisms

Question 11

Figure 20-2
Use the figure to answer the corresponding question(s). 
-If two populations diverge geographically and/or genetically from each other, and the process continues long enough, they may become two different:

Accepted Answer

A)  species. 
B)  hybrids. 
C)  polyploids. 
D)  allopolyploids. 
E)  euploids.

Question 12

As a result of __________, large dogs such as Great Danes do not normally mate with small dogs such as Poodles.

Accepted Answer

A)  temporal isolation 
B)  mechanical isolation 
C)  gametic isolation 
D)  sexual isolation 
E)  postzygotic barriers

Question 13

Which of the following statements about allopolyploidy is false?

Accepted Answer

A)  It can result in a new, reproductively isolated species in just one generation. 
B)  Many flowering plant species are allopolyploids. 
C)  It accounts for a large portion of the remarkable species diversity observed on Earth today. 
D)  The hybrid may have a combination of traits conferring greater fitness than the parent species. 
E)  The hybrid may assume a new role in the environment and so coexist with the parent species.

Question 14

Speciation:

Accepted Answer

A)  maintains an intermediate phenotype in a stable environment. 
B)  is the formation of a new species from an ancestral population. 
C)  only occurs when a population is geographically isolated. 
D)  is a change in allele frequencies in a population. 
E)  is the end result of macroevolution but not microevolution.

Question 15

Temporal isolation and mechanical isolation are reproductive isolating mechanisms that are classified as:

Accepted Answer

A)  homozygotic barriers. 
B)  prezygotic barriers. 
C)  heterozygotic barriers 
D)  postzygotic barriers. 
E)  homozygotic barriers

Question 16

If two species have incompatible mating structures, then __________ will prevent them from mating.

Accepted Answer

A)  temporal isolation 
B)  mechanical isolation 
C)  gametic isolation 
D)  sexual isolation 
E)  postzygotic barriers

Question 17

__________ prevent fish sperm from fertilizing frog eggs.

Accepted Answer

A)  Energetic barriers 
B)  Biological barriers 
C)  Postzygotic barriers 
D)  Ecological barriers 
E)  Prezygotic barriers

Question 18

Two mammals, a sheep and a goat, produce offspring.Only the F1 and F2 generations produce fertile offspring.This is occurs as result of:

Accepted Answer

A)  hybrid breakdown. 
B)  hybrid inviability. 
C)  hybrid sterility. 
D)  macroevolution. 
E)  microevolution.

Question 19

Which of the following is most likely to occur if a parasite accidentally introduced into the Great Lakes kills 95% of all living organisms living in the lakes?

Accepted Answer

A)  hybridization 
B)  mass extinction of the surviving organisms 
C)  allopatric speciation in the surviving organisms 
D)  adaptive radiation of the surviving populations 
E)  evolution of surviving organism

Question 20

MATCHING
Match the following terms with their description
a.accounts for the abrupt appearance of new species in the fossil record in absence of transitional fosssils
d.contains multiple sets of chromosomes from 2 or more species
b.species with a inheritable unique diagnostic trait
e.the possession of more than 2 genomes
c.speciation results from their divergence in genetic composition
-evolutionary species concept

Accepted Answer