Q: Which of the following equations best represents the concept of relative fitness ($$w) in a $$population?

$$w = \frac{\text{number of offspring of genotype}}{\text{highest number of offspring produced by any genotype}}$$

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, ranging from light to dark. If a new predator is introduced that more easily spots dark mice, which of the following is most likely to occur over several generations according to natural selection?

Accepted Answer

The frequency of light coat color alleles will increase.

Question 3

Which of the following is NOT a requirement for evolution by natural selection to occur?

Accepted Answer

All individuals have equal reproductive success.

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 of the following scenarios best illustrates acclimation rather than adaptation?

Accepted Answer

A plant wilts during a drought but recovers when watered.

Question 6

Which of the following equations best represents the concept of relative fitness ($$w) in a $$population?

Accepted Answer

$$w = \frac{	ext{number of offspring of genotype}}{	ext{highest number of offspring produced by any genotype}}$$

Question 7

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

Accepted Answer

It cannot be applied to asexual organisms or fossils.

Question 8

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

Accepted Answer

Biological Species Concept

Question 9

Which of the following best describes the process of natural selection?

Accepted Answer

Differential survival and reproduction of individuals due to differences in phenotype.

Question 10

In a population of beetles, green individuals are more likely to survive and reproduce in a grassy environment than brown individuals. Over time, the population becomes predominantly green. This is an example of:

Accepted Answer

Natural selection

Question 11

Which of the following statements about adaptation is correct?

Accepted Answer

Adaptation is a population-level process that occurs over many generations.

Question 12

Which species concept is most likely to recognize cryptic species that are morphologically similar but genetically distinct?

Accepted Answer

Phylogenetic Species Concept

Question 13

A population of bacteria is exposed to an antibiotic. Some bacteria survive due to a genetic mutation. Over time, the population becomes resistant. Which requirement of natural selection does this scenario best illustrate?

Accepted Answer

Agents of selection operate on individuals.

Question 14

Which of the following best explains why the Phylogenetic Species Concept can be more useful than the Biological Species Concept for classifying extinct organisms?

Accepted Answer

It uses unique derived characters that can be identified in fossils.

Question 15

Which of the following is an example of a real-world agent of selection?

Accepted Answer

A drought that kills plants unable to conserve water

Question 16

If a population of lizards is split by a newly formed river and the two groups evolve independently, eventually becoming distinct species, this is an example of:

Accepted Answer

Allopatric speciation

Question 17

Which of the following best summarizes Darwin's idea of how species originate?

Accepted Answer

Species arise from ancestral species through branching evolution.

Question 18

A researcher is studying two populations of birds that look different but can interbreed and produce fertile offspring. According to the Biological Species Concept, these populations should be considered:

Accepted Answer

The same species

Question 19

Which of the following is a key difference between acclimation and adaptation?

Accepted Answer

Acclimation is a short-term response by individuals; adaptation is a long-term evolutionary process in populations.

Question 20

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

Accepted Answer

Natural selection is one of several mechanisms that can drive evolution.

Species and Evolution by Natural Selection: Concepts and Mechanisms (Lecture 6)

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