Question 1

Which of the following best describes the process of allopatric speciation?

Accepted Answer

A population forms a new species while geographically isolated from its parent population.

Question 2

Which of the following is a prezygotic barrier to reproduction?

Accepted Answer

Gametes from two species fail to fuse due to incompatible surface proteins.

Question 3

A population of plants undergoes polyploidy, resulting in a new species. Which equation represents the chromosome number of the new tetraploid species if the original diploid species had $$2n = 14$$ chromosomes?

Accepted Answer

$$4n = 28$$

Question 4

Which species concept defines a species as a group of organisms that can interbreed and produce viable, fertile offspring?

Accepted Answer

Biological species concept

Question 5

Darwin’s finches on the Galápagos Islands are an example of which type of speciation?

Accepted Answer

Allopatric speciation due to geographic isolation

Question 6

Which of the following scenarios best illustrates a postzygotic barrier?

Accepted Answer

Two species of salamanders mate and produce offspring that die before reaching sexual maturity.

Question 7

In a hybrid zone, which outcome is most likely if hybrids have lower fitness than either parent species?

Accepted Answer

Reinforcement, strengthening reproductive barriers

Question 8

Which of the following is NOT a mechanism that can lead to genetic isolation and speciation?

Accepted Answer

Gene flow between populations

Question 9

A population of insects splits into two groups, one feeding on apples and the other on hawthorn. Over time, they develop different mating times and preferences. What type of speciation is this?

Accepted Answer

Sympatric speciation due to habitat and temporal isolation

Question 10

Which of the following equations best represents the process of allopolyploidy in plants, where two species with chromosome numbers $$2n_1$$ and $$2n_2$$ hybridize and double their chromosomes?

Accepted Answer

$$2n_1 + 2n_2$$

Question 11

Which of the following statements about the punctuated equilibrium model of speciation is correct?

Accepted Answer

It proposes that species remain unchanged for long periods, interrupted by rapid speciation events.

Question 12

Which of the following is an example of reinforcement in a hybrid zone?

Accepted Answer

Reproductive barriers between two species become stronger, reducing hybrid formation.

Question 13

If two populations are only partially isolated and occasionally produce hybrids, what is a possible long-term outcome?

Accepted Answer

The populations may continue to diverge, remain partially differentiated, or form new species through hybridization.

Question 14

Which of the following is a real-world example of postzygotic isolation?

Accepted Answer

Mules, the offspring of horses and donkeys, are sterile.

Question 15

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

Accepted Answer

Plants can reproduce asexually and tolerate changes in chromosome number.

Question 16

Which of the following is a key requirement for speciation to occur?

Accepted Answer

Genetic isolation leading to divergence

Question 17

Which of the following is an example of a morphological species concept?

Accepted Answer

Defining species based on distinct physical characteristics.

Question 18

If a population of rice plants undergoes autopolyploidy, doubling its chromosome number from $$2n = 24 to$$ $$4n = 48$$, what is the most likely immediate effect?

Accepted Answer

The new polyploid plants are reproductively isolated from the original diploid population.

Question 19

Which of the following best describes the role of natural selection in speciation?

Accepted Answer

Natural selection can drive divergence between isolated populations, leading to speciation.

Speciation: Mechanisms, Barriers, and Species Concepts

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