Q: A population of beetles has two alleles for a gene: A and a. If the frequency of allele A ($$p) is 0.7 $$and the frequency of allele a ($$q) is 0.3$$, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the difference between instinctive and learned behaviors in animals?

Accepted Answer

Instinctive behaviors are genetically programmed and do not depend on prior experience, while learned behaviors require specific experiences during development.

Question 2

A population of beetles has two alleles for a gene: A and a. If the frequency of allele A ($$p) is 0.7 $$and the frequency of allele a ($$q) is 0.3$$, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 3

Which of the following is an example of disruptive selection?

Accepted Answer

A population of rabbits where both very light and very dark fur colors are favored, while intermediate colors are selected against.

Question 4

Which of the following scenarios best illustrates the founder effect?

Accepted Answer

A few birds from a mainland population colonize a distant island, carrying only a small sample of the genetic variation from the original population.

Question 5

Which of the following is NOT an assumption of the Hardy-Weinberg equilibrium?

Accepted Answer

Mutation rates are extremely high.

Question 6

A scientist discovers two populations of frogs that look nearly identical but do not interbreed in the wild due to differences in their mating calls. Which species concept is the scientist using to distinguish them?

Accepted Answer

Biological species concept

Question 7

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Hybrid sterility

Question 8

Which process is most likely responsible for the evolution of antibiotic resistance in bacteria within a hospital setting?

Accepted Answer

Natural selection

Question 9

Which of the following statements about gene flow is correct?

Accepted Answer

Gene flow is the movement of alleles between populations and can have unpredictable effects on fitness.

Question 10

A paleontologist uses the ratio of $$^{14}C to$$ $$^{12}C in a $$fossil to estimate its age. If the half-life of $$^{14}C is 5$$,730 years and only 25% of the original $$^{14}C$$ remains, approximately how old is the fossil?

Accepted Answer

$$11,460$$ years

Question 11

Which of the following best explains why the fossil record is biased?

Accepted Answer

Only organisms with hard parts and those that are abundant and widespread are likely to be preserved as fossils.

Question 12

Which of the following is an example of convergent evolution?

Accepted Answer

Wings of bats and wings of birds, which evolved independently in response to similar environmental pressures.

Question 13

Which of the following is a synapomorphy?

Accepted Answer

A derived trait shared by two or more taxa that evolved from a recent common ancestor.

Question 14

Which of the following best describes the principle of parsimony in phylogenetic analysis?

Accepted Answer

The tree with the fewest evolutionary changes is preferred.

Question 15

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

Accepted Answer

A population of insects splits into two groups after a river changes course, physically separating them and preventing gene flow.

Question 16

Which of the following is a key difference between the biological and morphological species concepts?

Accepted Answer

The biological species concept relies on reproductive isolation, while the morphological species concept relies on physical similarities and differences.

Question 17

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

Accepted Answer

Gametic isolation

Question 18

Which of the following statements about prokaryotes is correct?

Accepted Answer

Prokaryotes reproduce by binary fission and can adapt rapidly to environmental changes.

Question 19

Which of the following best describes the process of endosymbiosis in the origin of eukaryotic cells?

Accepted Answer

A prokaryotic cell engulfed another cell capable of aerobic respiration, resulting in the formation of mitochondria.

Question 20

Which of the following is a consequence of continental drift for biological evolution?

Accepted Answer

It can lead to allopatric speciation by isolating populations on different land masses.

General Biology: Animal Behavior, Evolution, Population Genetics, Speciation, Macroevolution, and Systematics

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