Question 1

Which of the following statements about plant speciation and hybridization is false?

Accepted Answer

A) Plant biologists estimate that 80% of all living plant species are descended from ancestors that formed by polyploid speciation. 
B) Bread wheat grown widely today is the result of several hybridization events. 
C) Bread wheat is the ancestral diploid wheat plant. 
D) Modern plant geneticists use chemicals to induce meiotic and mitotic errors to try to create new hybrid plants with special qualities. 
A) Plant biologists estimate that 80% of all living plant species are descended from ancestors that formed by polyploid speciation. 
B) Bread wheat grown widely today is the result of several hybridization events. 
C) Bread wheat is the ancestral diploid wheat plant. 
D) Modern plant geneticists use chemicals to induce meiotic and mitotic errors to try to create new hybrid plants with special qualities.

Question 2

Which of the following would tend to promote adaptive radiation?

Accepted Answer

A) A single species goes extinct,but it has several competitors that quickly expand to assume its ecological roles. 
B) An organism colonizes an isolated area that is habitable but relatively devoid of life. 
C) An organism colonizes an area that already has a high level of existing species diversity. 
D) An organism has a very stable set of features and capabilities over long spans of evolutionary time. 
A) A single species goes extinct,but it has several competitors that quickly expand to assume its ecological roles. 
B) An organism colonizes an isolated area that is habitable but relatively devoid of life. 
C) An organism colonizes an area that already has a high level of existing species diversity. 
D) An organism has a very stable set of features and capabilities over long spans of evolutionary time.

Question 3

Which provides the most general and correct description of the idea of a reproductive barrier?

Accepted Answer

A) a geographic barrier that separates two species and prevents gene flow between them 
B) a difference in behavior that keeps two species from interbreeding 
C) a biological difference between two species that prevents them from successfully interbreeding 
D) any feature (of geography,behavior,or morphology)that keeps one species from mating with another 
A) a geographic barrier that separates two species and prevents gene flow between them 
B) a difference in behavior that keeps two species from interbreeding 
C) a biological difference between two species that prevents them from successfully interbreeding 
D) any feature (of geography,behavior,or morphology)that keeps one species from mating with another

Question 4

Two bird species overlap in a hybrid zone.They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song.Hybrid offspring tend to have reduced fertility compared to either of the parent species.What effect might natural selection have in this situation?

Accepted Answer

A) Natural selection could lead to the stronger of the two species taking over and eliminating the other species. 
B) Natural selection could lead to the hybrid species taking over and eliminating the weaker parent species. 
C) Natural selection might favor males with more distinctive calls and/or females that are more "choosy." As a result,the reproductive barrier between the two species could be reinforced. 
D) Natural selection might favor males with less distinctive calls and/or females that are less "choosy." 
A) Natural selection could lead to the stronger of the two species taking over and eliminating the other species. 
B) Natural selection could lead to the hybrid species taking over and eliminating the weaker parent species. 
C) Natural selection might favor males with more distinctive calls and/or females that are more "choosy." As a result,the reproductive barrier between the two species could be reinforced. 
D) Natural selection might favor males with less distinctive calls and/or females that are less "choosy."

Exam 14: The Origin of Species

Which of the following statements about plant speciation and hybridization is false?

Which of the following would tend to promote adaptive radiation?

Which provides the most general and correct description of the idea of a reproductive barrier?

Biology: Exploring Life

The Chemical Basis of Life

The Molecules of Cells

A Tour of the Cell

The Working Cell

How Cells Harvest Chemical Energy

Photosynthesis: Using Light to Make Food

The Cellular Basis of Reproduction and Inheritance

Patterns of Inheritance

Molecular Biology of the Gene

How Genes Are Controlled

Dna Technology and Genomics

How Populations Evolve

Tracing Evolutionary History

Microbial Life: Prokaryotes and Protists

The Evolution of Plant and Fungal Diversity

The Evolution of Invertebrate Diversity

The Evolution of Vertebrate Diversity

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Gas Exchange

Circulation

The Immune System

Control of Body Temperature and Water Balance

Hormones and the Endocrine System

Reproduction and Embryonic Development

Nervous Systems

The Senses

How Animals Move

Plant Structure,growth,and Reproduction

Plant Nutrition and Transport

Control Systems in Plants

The Biosphere: an Introduction to Earths Diverse Environments

Behavioral Adaptations to the Environment

Population Ecology

Communities and Ecosystems

Conservation Biology

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