Question 1

Which of the following best describes the difference between microevolution and macroevolution?

Accepted Answer

Microevolution refers to changes in allele frequencies within a population over time, while macroevolution refers to the broad patterns of evolutionary change above the species level.

Question 2

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

Accepted Answer

Temporal isolation

Question 3

A population of fish is split by the formation of a new river, resulting in two isolated groups. Over time, these groups evolve into separate species. What type of speciation has occurred?

Accepted Answer

Allopatric speciation

Question 4

Which equation correctly represents the calculation of allele frequency for allele A in a population?

Accepted Answer

$$f(A) = \frac{2N_{AA} + N_{Aa}}{2N}$$

Question 5

Which scenario best illustrates sympatric speciation?

Accepted Answer

A population of plants develops a genetic mutation that leads to polyploidy, resulting in a new species within the same geographic area.

Question 6

Which of the following is NOT a limitation of the biological species concept?

Accepted Answer

It can be used to define species based on morphological differences alone.

Question 7

A hybrid 'grolar bear' is produced from a polar bear and a grizzly bear. If this hybrid is fertile and can reproduce, what does this suggest about the reproductive barriers between these species?

Accepted Answer

There are weak or incomplete postzygotic barriers.

Question 8

Which of the following best describes punctuated equilibrium?

Accepted Answer

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

Question 9

In a population of diploid organisms with $$n=6$$ chromosomes, how many chromosomes will be present in a tetraploid cell?

Accepted Answer

$$24$$

Question 10

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

Accepted Answer

Hybrid breakdown

Question 11

A population of snapping shrimp is separated by the formation of the Isthmus of Panama. Over millions of years, the Atlantic and Pacific populations diverge genetically. What evolutionary process is primarily responsible for this divergence?

Accepted Answer

Allopatric speciation due to geographic isolation

Question 12

Which of the following mechanisms can lead to reinforcement of reproductive barriers?

Accepted Answer

Selection against hybrid offspring

Question 13

Which of the following is most likely to result in the formation of a new species in plants?

Accepted Answer

Polyploidy

Question 14

Which of the following statements about gene flow is correct?

Accepted Answer

Gene flow decreases genetic differences between populations.

Question 15

Which of the following is a real-world example of allopatric speciation?

Accepted Answer

Snapping shrimp populations separated by the Isthmus of Panama

Question 16

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

Accepted Answer

It cannot be applied to extinct species known only from fossils.

Question 17

A population of mosquitofish develops differences in body shape due to predation pressure. Females prefer to mate with males of similar body shape. What type of reproductive barrier is this?

Accepted Answer

Behavioral isolation

Question 18

Which of the following best explains why reinforcement of reproductive barriers is more likely to occur in sympatric populations than in allopatric populations?

Accepted Answer

Sympatric populations are in contact, so selection can act against hybrids, strengthening barriers.

Question 19

Which of the following is a key feature of the gradual model of evolution?

Accepted Answer

Slow, continuous accumulation of small changes over time

Speciation and Macroevolution (Chapter 24) – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드