Question 1

Which of the following best describes the biological species concept?

Accepted Answer

A group of interbreeding organisms that can produce viable offspring and are reproductively isolated from other such groups.

Question 2

Which process is illustrated when a population is separated by a barrier, leading to genetic divergence and eventually reproductive isolation?

Accepted Answer

Allopatric speciation

Question 3

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

Accepted Answer

Mechanical isolation

Question 4

A grizzly bear (U. arctos) and a polar bear (U. maritimus) can produce a hybrid called a 'grolar bear.' What does this indicate about their reproductive barriers?

Accepted Answer

They have weak postzygotic barriers.

Question 5

In an experiment, fruit flies raised on different food sources (starch vs. maltose) showed a preference for mating with flies raised on the same food. What evolutionary process does this demonstrate?

Accepted Answer

Ecological speciation

Question 6

Which of the following is NOT a prezygotic barrier to reproduction?

Accepted Answer

Hybrid breakdown

Question 7

If two populations of birds (such as black-capped and Carolina chickadees) overlap geographically but rarely interbreed due to differences in their songs, which type of reproductive barrier is this?

Accepted Answer

Behavioral isolation

Question 8

Which isotope is most appropriate for dating fossils less than 50,000 years old?

Accepted Answer

Carbon-14

Question 9

Given the half-life of Carbon-14 is 5,730 years, how much of the original isotope remains after 17,190 years?

Accepted Answer

One-eighth ($$\frac{1}{8}) of $$the original amount

Question 10

Which large-scale process is NOT directly responsible for changes in the diversity of life on Earth?

Accepted Answer

Gene flow within a population

Question 11

Which of the following best explains why hybrid zones can persist between two diverging species?

Accepted Answer

Hybrids have reduced fitness but are still produced.

Question 12

Which concept defines a species based on its ecological niche?

Accepted Answer

Ecological species concept

Question 13

If a population of frogs is separated by a mountain range and each group adapts to its own environment, eventually becoming reproductively isolated, which evolutionary mechanism is at work?

Accepted Answer

Allopatric speciation

Question 14

Which of the following is a postzygotic barrier?

Accepted Answer

Reduced hybrid fertility

Question 15

Which scenario best illustrates reinforcement in a hybrid zone?

Accepted Answer

Hybrids are produced but have reduced fitness, leading to increased reproductive isolation.

Question 16

Which statement about natural selection is correct?

Accepted Answer

Natural selection improves organs or functions but is not goal-oriented.

Question 17

Which of the following is a real-world example of adaptive radiation?

Accepted Answer

The diversification of mammals after the extinction of dinosaurs.

Question 18

If a fossil is found to have only $$\frac{1}{16} of $$its original Carbon-14, how many half-lives have passed?

Accepted Answer

4

Question 19

Which of the following is NOT a possible outcome for a hybrid zone?

Accepted Answer

Extinction of both parent species

Question 20

Which statement best describes the role of gene flow in speciation?

Accepted Answer

Gene flow prevents populations from becoming reproductively isolated.

Macroevolution and Speciation: Life on Earth

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