Question 1

Which of the following best describes allopatric speciation?

Accepted Answer

Speciation that occurs when populations are separated by a physical barrier, leading to genetic divergence.

Question 2

A population of plants is separated by a newly formed river, and over time, the two groups evolve into distinct species. Which process is most likely responsible for this speciation event?

Accepted Answer

Allopatric speciation via vicariance

Question 3

Which of the following is an example of intrinsic factors leading to sympatric speciation?

Accepted Answer

Polyploidy resulting in reproductive isolation

Question 4

A botanist discovers a new plant species that arose when two different species hybridized and then doubled their chromosome number. What is this process called?

Accepted Answer

Allopolyploidy

Question 5

Which of the following scenarios best illustrates adaptive radiation?

Accepted Answer

A single ancestral bird species colonizes an island chain and rapidly diversifies into multiple species, each adapted to a different ecological niche.

Question 6

Which of the following is NOT a possible outcome when two populations that have diverged come back into contact?

Accepted Answer

Polyploidy

Question 7

Which type of reproductive isolation occurs when two species breed at different times of the year?

Accepted Answer

Prezygotic isolation

Question 8

A hybrid zone is most likely to persist when:

Accepted Answer

Hybrids have intermediate fitness compared to parent species.

Question 9

Which of the following best defines a monophyletic group?

Accepted Answer

A group that includes an ancestor and all of its descendants.

Question 10

Which species concept relies on the ability of individuals to interbreed and produce viable, fertile offspring?

Accepted Answer

Biological species concept

Question 11

A researcher is studying two populations of frogs that look identical but do not interbreed in the wild due to differences in mating calls. Which species concept would most likely consider them separate species?

Accepted Answer

Biological species concept

Question 12

Which of the following is a key difference between autopolyploidy and allopolyploidy?

Accepted Answer

Autopolyploidy involves chromosome duplication within a single species, while allopolyploidy involves hybridization between different species followed by chromosome doubling.

Question 13

Which of the following equations represents the total number of possible chromosome combinations in gametes due to independent assortment, where $$n is $$the haploid number?

Accepted Answer

$$2^{n}$$

Question 14

A population of insects rapidly diversifies into many new species after colonizing a new environment with many unoccupied niches. This process is best described as:

Accepted Answer

Adaptive radiation

Question 15

Which of the following is an example of prezygotic reproductive isolation?

Accepted Answer

Two species of orchids release pollen at different times of day, preventing cross-pollination.

Question 16

Which scenario would most likely lead to reinforcement between two diverging populations?

Accepted Answer

Hybrids have lower fitness than either parent population.

Question 17

Which of the following best describes the morphospecies concept?

Accepted Answer

Species are defined based on morphological differences.

Question 18

A scientist uses DNA sequence data to construct a phylogenetic tree and identify species. Which species concept is being applied?

Accepted Answer

Phylogenetic species concept

Question 19

Which of the following is an example of vicariance leading to speciation?

Accepted Answer

A river changes course, splitting a population of rodents into two isolated groups.

Question 20

Which of the following best explains why polyploidy is more common as a mechanism of speciation in plants than in animals?

Accepted Answer

Plants can often self-fertilize and tolerate changes in chromosome number, while animals usually cannot.

Speciation and Species Concepts in Evolutionary Biology

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