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BIO-1407 Chapter 24

Authored by Chris Susi

Biology

University

NGSS covered

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BIO-1407 Chapter 24
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15 questions

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1.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following best describes microevolution?

The small-scale changes in allele frequencies within a population over time
The broad accumulation of differences leading to extinction or diversification
The formation of entirely new taxonomic groups above the species level
The sudden appearance of species in the fossil record

Answer explanation

Microevolution is the change in allele frequencies within a population over time, whereas macroevolution involves broad evolutionary change above the species level.

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-2

2.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

According to the biological species concept, what is the primary criterion for defining a species?

Members share similar morphological features
Members occupy the same ecological niche
Members have a shared evolutionary history
Members interbreed to produce viable, fertile offspring

Answer explanation

The biological species concept defines a species as populations whose members interbreed naturally and produce viable, fertile offspring.

3.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

A mule, the offspring of a horse and donkey, is robust but sterile. This is an example of:

Reduced hybrid fertility
Mechanical isolation
Gametic isolation
Temporal isolation

Answer explanation

Mules are sterile hybrids, which is a postzygotic barrier known as reduced hybrid fertility.

4.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which scenario best illustrates allopatric speciation?

Apple maggot flies diverge into two groups based on different host plants
A plant species develops polyploidy, producing fertile offspring in one generation
A lake splits into two smaller lakes, causing populations of fish to diverge
Cichlid fish diverge due to female mate choice of male coloration

Answer explanation

Allopatric speciation occurs when populations are geographically isolated, such as when a lake splits into two.

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-2

5.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

If two species of frogs produce hybrids that have lower fitness than either parent species, what outcome is most likely?

Stability
Reinforcement
Fusion
Polyploidy

Answer explanation

Reinforcement strengthens reproductive barriers when hybrids have reduced fitness.

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-5

6.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

A paleontologist studies fossil records showing long periods of little change punctuated by sudden species appearances. Which model does this support?

Reinforcement
Gradualism
Hybrid breakdown
Punctuated equilibrium

Answer explanation

The punctuated equilibrium model describes long periods of stasis interrupted by sudden changes.

7.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following best illustrates macroevolution?

A shift in allele frequency for coat color in a wolf population
The frequency of a resistance gene increases in bacterial populations
A population of finches shows a gradual increase in beak depth over generations
The rise of mammals after the extinction of dinosaurs

Answer explanation

Macroevolution involves broad evolutionary changes above the species level, such as the emergence of mammals.

Tags

NGSS.HS-LS4-5

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