Question 1

Which of the following best describes the Biological Species Concept?

Accepted Answer

Species are groups of actually or potentially interbreeding organisms that are reproductively isolated from other such groups.

Question 2

A population of mice shows variation in coat color from light to dark. If a falcon preferentially preys on light-colored mice in a dark environment, which requirement of natural selection is being demonstrated?

Accepted Answer

Agents of selection operate directly on some individuals in the population.

Question 3

Which of the following is a major limitation of the Biological Species Concept?

Accepted Answer

It cannot be applied to organisms that reproduce asexually.

Question 4

According to the Evolutionary Species Concept, what defines a species?

Accepted Answer

A single lineage of ancestral-to-descendent populations that maintains its identity from other such lineages and has its own evolutionary tendencies and historical fate.

Question 5

Which species concept focuses on diagnosable differences in derived character states?

Accepted Answer

Phylogenetic Species Concept

Question 6

Relative fitness ($$w) is a $$measure of an individual's reproductive success compared to others in the population. If a genotype produces 8 offspring and the most successful genotype produces 10 offspring, what is the relative fitness of the first genotype?

Accepted Answer

$$w = \frac{8}{10} = 0.8$$

Question 7

Which of the following scenarios best illustrates acclimation rather than adaptation?

Accepted Answer

A plant increases its leaf thickness during a single season in response to drought.

Question 8

In the context of natural selection, which of the following is NOT a requirement for evolution to occur?

Accepted Answer

All individuals must have equal reproductive success.

Question 9

A population of insects is split by a river, and over time, the two groups accumulate genetic differences and can no longer interbreed. Which species concept would most easily recognize these as separate species?

Accepted Answer

Biological Species Concept

Question 10

Which of the following best explains why natural selection does not always lead to 'perfect' organisms?

Accepted Answer

Natural selection can only act on existing variation, and may be limited by genetic constraints and trade-offs.

Question 11

If a population of deer mice ($$Peromyscus melanophrys) $$has a genetic basis for coat color, and dark-colored mice survive better in a forest with dark soil, what evolutionary process is most likely occurring?

Accepted Answer

Natural selection

Question 12

Which of the following is an example of a derived character state used in the Phylogenetic Species Concept?

Accepted Answer

A unique DNA sequence found only in one group of organisms.

Question 13

Darwin's idea of species origination involves branching and nodes. In a phylogenetic tree, what does a node represent?

Accepted Answer

A common ancestor from which two species diverge.

Question 14

Which of the following statements about adaptation is correct?

Accepted Answer

Adaptation involves evolutionary changes in a population over long time scales.

Question 15

A scientist discovers two populations of frogs that look identical but have distinct genetic markers and do not interbreed. Which species concept would most likely classify them as separate species?

Accepted Answer

Biological Species Concept

Question 16

Which equation best represents the calculation of relative fitness ($$w) in a $$population?

Accepted Answer

$$w = \frac{	ext{number of offspring by genotype}}{	ext{number of offspring by most successful genotype}}$$

Question 17

Which of the following is NOT a major species concept discussed in the lecture?

Accepted Answer

Ecological Species Concept

Question 18

A population of plants is exposed to a new herbicide. Some individuals survive due to a genetic mutation. Over generations, the frequency of the mutation increases. Which process is responsible for this change?

Accepted Answer

Natural selection

Question 19

Which of the following best describes the relationship between evolution and natural selection?

Accepted Answer

Evolution is the process, and natural selection is one of the mechanisms by which it occurs.

Question 20

Which of the following would NOT be considered a species under the Biological Species Concept?

Accepted Answer

A group of bacteria that reproduce asexually.

Species and Evolution by Natural Selection: Concepts and Mechanisms

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