Question 1

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

Accepted Answer

A population is divided by a geographic barrier, leading to genetic divergence and the formation of new species.

Question 2

According to the biological species concept, which of the following is required for two populations to be considered separate species?

Accepted Answer

They cannot produce viable, fertile offspring together.

Question 3

Which of the following is an example of a prezygotic reproductive barrier?

Accepted Answer

Two species of frogs breed in different seasons, preventing interbreeding.

Question 4

Which scenario best illustrates habitat isolation as a prezygotic barrier?

Accepted Answer

Apple maggot flies and blueberry maggot flies feed and lay eggs on different fruits, rarely encountering each other.

Question 5

Which of the following is a limitation of the biological species concept?

Accepted Answer

It cannot be applied to asexual organisms or fossils.

Question 6

A plant species undergoes a doubling of its chromosome number due to an error in cell division, resulting in a new species. This is an example of:

Accepted Answer

Autopolyploidy

Question 7

Which of the following best explains why mass extinctions are often followed by adaptive radiations?

Accepted Answer

Mass extinctions open up ecological niches, allowing surviving species to diversify and fill new roles.

Question 8

Which of the following statements about the fossil record is correct?

Accepted Answer

It is biased toward species that were abundant, widespread, and had hard parts.

Question 9

Which process is described by the equation $$N_t = N_0$ 	imes (\frac{1}{2}$$)^{t/T_{1/2}$$}$$, where $$N_t is $$the amount of radioactive isotope remaining after time $$t$$, $$N_0 is $$the initial amount, and $$T_{1/2} is $$the half-life?

Accepted Answer

Radiometric dating

Question 10

Which of the following is an example of exaptation?

Accepted Answer

Feathers that originally evolved for temperature regulation later being used for flight in birds.

Question 11

Which event is most closely associated with the rapid increase in atmospheric oxygen about 2.4 billion years ago?

Accepted Answer

The evolution of photosynthetic prokaryotes

Question 12

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Hybrid offspring of a horse and donkey (mule) are sterile.

Question 13

Which of the following best describes the concept of punctuated equilibrium?

Accepted Answer

Species remain relatively unchanged for long periods, interrupted by brief periods of rapid change.

Question 14

Which of the following is a consequence of continental drift?

Accepted Answer

Geographic isolation of populations, leading to allopatric speciation.

Question 15

Which of the following is an example of heterochrony?

Accepted Answer

Changes in the timing of reproductive organ development resulting in sexually mature individuals with juvenile features.

Question 16

Which of the following is NOT a requirement for the formation of a new species according to the biological species concept?

Accepted Answer

Morphological similarity between populations.

Question 17

Which of the following best explains why the first genetic material was likely RNA rather than DNA?

Accepted Answer

RNA can both store genetic information and catalyze chemical reactions.

Question 18

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

Accepted Answer

Western spotted skunks mate in summer, while eastern spotted skunks mate in winter.

Question 19

Which of the following is a direct result of the endosymbiotic theory for the origin of eukaryotes?

Accepted Answer

Mitochondria and plastids have their own DNA, similar to bacteria.

Question 20

Which of the following best describes adaptive radiation?

Accepted Answer

A rapid evolutionary diversification of a single lineage into many species, each adapted to a different ecological niche.

Speciation and the History of Life on Earth – Study Notes

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