Question 1

When two organisms reach sexual maturity at different times, it is an example of

Accepted Answer

A)  temporal isolation. 
B)  hybrid inviability. 
C)  hybrid infertility. 
D)  hybrid vigor. 
E)  gametic incompatibility. 
A)  temporal isolation. 
B)  hybrid inviability. 
C)  hybrid infertility. 
D)  hybrid vigor. 
E)  gametic incompatibility.

Question 2

Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States. As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for

Accepted Answer

A)  hybrid inviability. 
B)  mechanical incompatibility. 
C)  hybridization. 
D)  temporal isolation. 
E)  speciation. 
A)  hybrid inviability. 
B)  mechanical incompatibility. 
C)  hybridization. 
D)  temporal isolation. 
E)  speciation.

Question 3

Store-bought hybrid tomatoes are very popular with consumers. Suppose you buy a tomato from the grocery store, collect seeds from it, and plant the seeds. If the seeds do not germinate, the seedlings fail to thrive, or the plants die quickly after sprouting, what reproductive isolating mechanism might be responsible?

Accepted Answer

The answer of Store-bought hybrid tomatoes are very popular with...

Question 4

Polyploidy is an important mechanism of speciation in animals.

Accepted Answer

A) True 
 B)False

Question 5

Two organisms that live on different islands are experiencing _________isolation.

Accepted Answer

The answer of Two organisms that live on different islands...

Question 6

The series of events depicted in the figure demonstrates

Accepted Answer

A)  hybrid infertility. 
B)  mechanical incompatibility. 
C)  temporal isolation. 
D)  behavioral isolation. 
E)  allopatric speciation. 
A)  hybrid infertility. 
B)  mechanical incompatibility. 
C)  temporal isolation. 
D)  behavioral isolation. 
E)  allopatric speciation.

Question 7

Lions and tigers can interbreed and produce offspring called tiglons or ligers, which have normal life spans but are sterile. Lions and tigers remain isolated genetically because of

Accepted Answer

A)  mechanical incompatibility. 
B)  hybrid infertility. 
C)  behavioral isolation. 
D)  hybrid inviability. 
E)  heterozygote disadvantage. 
A)  mechanical incompatibility. 
B)  hybrid infertility. 
C)  behavioral isolation. 
D)  hybrid inviability. 
E)  heterozygote disadvantage.

Question 8

The elaborate courtship rituals of many bird species help to preserve their genetic isolation through

Accepted Answer

A)  behavioral isolation. 
B)  allopatric separation. 
C)  mechanical incompatibility. 
D)  hybrid inviability. 
E)  temporal isolation. 
A)  behavioral isolation. 
B)  allopatric separation. 
C)  mechanical incompatibility. 
D)  hybrid inviability. 
E)  temporal isolation.

Question 9

Which statement best describes the reproductive isolation between populations of Rhagoletis flies, one of which is found on apple trees and the other that is found on hawthorn trees?

Accepted Answer

A)  Hybrid offspring of the two populations are sterile. 
B)  Hawthorn trees and apple trees grow in different areas, so the two populations do not encounter each other. 
C)  Eggs laid by female flies mated with a male from the ʺwrongʺ population do not develop. 
D)  Male flies of one population cannot physically mate with females from the other population. 
E)  Apple-liking males are more likely to encounter apple-liking females than hawthorn-liking females. 
A)  Hybrid offspring of the two populations are sterile. 
B)  Hawthorn trees and apple trees grow in different areas, so the two populations do not encounter each other. 
C)  Eggs laid by female flies mated with a male from the ʺwrongʺ population do not develop. 
D)  Male flies of one population cannot physically mate with females from the other population. 
E)  Apple-liking males are more likely to encounter apple-liking females than hawthorn-liking females.

Question 10

The Kaibab squirrel lives on the north side of the Grand Canyon, and the Abert squirrel lives on the south side. Even though these two populations are only miles apart, their gene pools are kept isolated by

Accepted Answer

A)  geographic isolation. 
B)  temporal isolation. 
C)  mechanical incompatibility. 
D)  hybrid infertility. 
E)  ecological isolation. 
A)  geographic isolation. 
B)  temporal isolation. 
C)  mechanical incompatibility. 
D)  hybrid infertility. 
E)  ecological isolation.

Question 11

Populations that were once considered separate species are sometimes reassigned to the same species because

Accepted Answer

A)  they are no longer capable of interbreeding. 
B)  it was discovered that they can produce viable and fertile offspring. 
C)  they have been found to be genetically identical. 
D)  they have evolved to look different from each other. 
E)  they have evolved to look the same. 
A)  they are no longer capable of interbreeding. 
B)  it was discovered that they can produce viable and fertile offspring. 
C)  they have been found to be genetically identical. 
D)  they have evolved to look different from each other. 
E)  they have evolved to look the same.

Question 12

Two species of plants that both use honeybees as pollinators but reproduce at different times of the year-one spring, the other midsummer-demonstrate geographic isolation.

Accepted Answer

A) True 
 B)False

Question 13

Einkorn (Triticum boeoticum) is an ancient grain with a diploid number of 14 (2n = 14). Durum (Triticum turgidum) appeared later. Durum grains are larger and the plant is hardier. It has twice the genetic material of Einkorn (2n = 28) but contains basically the same chromosomes. Can you propose a hypothesis on how durum evolved?

Accepted Answer

Durum could possibly be a poly

Question 14

Eastern and Western meadowlarks look almost identical and sometimes inhabit the same areas of prairies. These birds recognize members of their own species by distinctive songs and thus do not breed with each other. This is an example of

Accepted Answer

A)  temporal isolation. 
B)  ecological isolation. 
C)  mechanical isolation. 
D)  geographic isolation. 
E)  behavioral isolation. 
A)  temporal isolation. 
B)  ecological isolation. 
C)  mechanical isolation. 
D)  geographic isolation. 
E)  behavioral isolation.

Question 15

Crossing a zebra with a horse produces sterile offspring. This is an example of

Accepted Answer

A)  temporal isolation. 
B)  hybrid inviability. 
C)  hybrid infertility. 
D)  hybrid vigor. 
E)  gametic incompatibility. 
A)  temporal isolation. 
B)  hybrid inviability. 
C)  hybrid infertility. 
D)  hybrid vigor. 
E)  gametic incompatibility.

Question 16

Gametic incompatibility is an example of

Accepted Answer

A)  a postmating isolating mechanism. 
B)  hybrid inviability. 
C)  a premating isolating mechanism. 
D)  a geographic isolating mechanism. 
A)  a postmating isolating mechanism. 
B)  hybrid inviability. 
C)  a premating isolating mechanism. 
D)  a geographic isolating mechanism.

Question 17

A group of an interbreeding natural population that is reproductively isolated from other such groups is called a

Accepted Answer

A)  tribe. 
B)  genus. 
C)  species. 
D)  genotype. 
E)  community. 
A)  tribe. 
B)  genus. 
C)  species. 
D)  genotype. 
E)  community.

Question 18

Two species of garter snakes live in the same geographic area. One lives mainly in water and the other mainly on land; therefore, they rarely encounter each other and do not interbreed. What type of isolation is this?

Accepted Answer

A)  Geographic 
B)  Mechanical 
C)  Behavioral 
D)  Temporal 
E)  Ecological 
A)  Geographic 
B)  Mechanical 
C)  Behavioral 
D)  Temporal 
E)  Ecological

Question 19

Fruit fly species all look similar to one another. If you have a male and a female fruit fly, how can you prove that they are the same species, according to the biological species concept?

Accepted Answer

A)  If they can asexually reproduce and their offspring can also successfully asexually reproduce, they are the same species. 
B)  If they mate when they are put together, they are the same species. 
C)  If they mate successfully and their offspring are fertile, they are the same species. 
D)  Determine the base sequence of the DNA of their chromosomes. 
E)  Examine them closely with a low-power microscope, comparing their physical characteristics to published species key lists of characteristics. 
A)  If they can asexually reproduce and their offspring can also successfully asexually reproduce, they are the same species. 
B)  If they mate when they are put together, they are the same species. 
C)  If they mate successfully and their offspring are fertile, they are the same species. 
D)  Determine the base sequence of the DNA of their chromosomes. 
E)  Examine them closely with a low-power microscope, comparing their physical characteristics to published species key lists of characteristics.

Question 20

Two populations of plants found in the same meadow look identical but are fertilized by different pollinators-one by a night-flying hummingbird moth, the other by honeybees that fly by day. This is an example of

Accepted Answer

A)  ecological isolation. 
B)  mechanical incompatibility. 
C)  geographic isolation. 
D)  behavioral isolation. 
E)  temporal isolation. 
A)  ecological isolation. 
B)  mechanical incompatibility. 
C)  geographic isolation. 
D)  behavioral isolation. 
E)  temporal isolation.

Exam 17: The Origin of Species

When two organisms reach sexual maturity at different times, it is an example of

Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States. As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for

Polyploidy is an important mechanism of speciation in animals.

Two organisms that live on different islands are experiencing _________isolation.

The series of events depicted in the figure demonstrates

Lions and tigers can interbreed and produce offspring called tiglons or ligers, which have normal life spans but are sterile. Lions and tigers remain isolated genetically because of

The elaborate courtship rituals of many bird species help to preserve their genetic isolation through

Which statement best describes the reproductive isolation between populations of Rhagoletis flies, one of which is found on apple trees and the other that is found on hawthorn trees?

The Kaibab squirrel lives on the north side of the Grand Canyon, and the Abert squirrel lives on the south side. Even though these two populations are only miles apart, their gene pools are kept isolated by

Populations that were once considered separate species are sometimes reassigned to the same species because

Two species of plants that both use honeybees as pollinators but reproduce at different times of the year-one spring, the other midsummer-demonstrate geographic isolation.

Eastern and Western meadowlarks look almost identical and sometimes inhabit the same areas of prairies. These birds recognize members of their own species by distinctive songs and thus do not breed with each other. This is an example of

Crossing a zebra with a horse produces sterile offspring. This is an example of

Gametic incompatibility is an example of

A group of an interbreeding natural population that is reproductively isolated from other such groups is called a

Two species of garter snakes live in the same geographic area. One lives mainly in water and the other mainly on land; therefore, they rarely encounter each other and do not interbreed. What type of isolation is this?

Fruit fly species all look similar to one another. If you have a male and a female fruit fly, how can you prove that they are the same species, according to the biological species concept?

Two populations of plants found in the same meadow look identical but are fertilized by different pollinators-one by a night-flying hummingbird moth, the other by honeybees that fly by day. This is an example of

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

DNA: The Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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