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

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

Q: A population of rabbits is growing according to the logistic growth model. If the carrying capacity ($$K) is 500 $$and the population size ($$N) is $$currently 250, which equation correctly describes the population's growth rate ($$dN/dt) if $$the intrinsic rate of increase ($$r) is 0.2$$?

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right) = 0.2 \times 250 \times \left(1 - \frac{250}{500}\right) = 25$$

Question 1

Which of the following best describes the main difference between allopatric and sympatric speciation?

Accepted Answer

Allopatric speciation requires geographic isolation, whereas sympatric speciation occurs without physical separation.

Question 2

A population of beetles has two alleles for a gene: A and a. If the frequency of allele A is $$p = 0.7$$ and allele a is $$q = 0.3$$, 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 a real-world example of adaptive radiation?

Accepted Answer

The diversification of Darwin's finches on the Galápagos Islands into multiple species with different beak shapes.

Question 4

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

Accepted Answer

Gene flow occurs freely between populations.

Question 5

A researcher is studying a hybrid zone between two closely related bird species. Which outcome would most likely indicate reinforcement is occurring?

Accepted Answer

Hybrid individuals are sterile or have reduced viability.

Question 6

Which of the following best explains why prokaryotes are considered more metabolically diverse than eukaryotes?

Accepted Answer

Prokaryotes can use a wider range of energy sources and electron acceptors, including inorganic molecules.

Question 7

Which of the following is the best definition of a biological species according to the Biological Species Concept?

Accepted Answer

A group of populations whose members can interbreed and produce viable, fertile offspring.

Question 8

Which process is most likely to cause a population to evolve due to random changes in allele frequencies, especially in small populations?

Accepted Answer

Genetic drift

Question 9

A population of rabbits is growing according to the logistic growth model. If the carrying capacity ($$K) is 500 $$and the population size ($$N) is $$currently 250, which equation correctly describes the population's growth rate ($$dN/dt) if $$the intrinsic rate of increase ($$r) is 0.2$$?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}ight) = 0.2 	imes 250 	imes \left(1 - \frac{250}{500}ight) = 25$$

Question 10

Which of the following is an example of post-translational modification in eukaryotic cells?

Accepted Answer

Phosphorylation of a protein after translation

Question 11

Which of the following best describes the role of fungi in the environment?

Accepted Answer

Fungi are decomposers that break down organic matter and recycle nutrients.

Question 12

Which of the following is a key difference between exponential and logistic population growth?

Accepted Answer

Logistic growth slows as the population approaches carrying capacity, while exponential growth does not.

Question 13

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while obtaining nectar

Question 14

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

Accepted Answer

The fossil record documents the appearance, diversification, and extinction of species over time.

Question 15

Which of the following is a real-world example of gene flow?

Accepted Answer

Wolves from one pack migrating and breeding with wolves from another pack.

Question 16

Which of the following is a direct consequence of non-random mating in a population?

Accepted Answer

Genotype frequencies change, but allele frequencies may remain the same.

Question 17

Which of the following best describes the process of building a phylogenetic tree using cladistics?

Accepted Answer

Grouping organisms by shared derived characteristics (synapomorphies) to infer evolutionary relationships.

Question 18

Which of the following is an example of a density-dependent factor limiting population growth?

Accepted Answer

A contagious disease spreading more rapidly as population density increases.

Question 19

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

Accepted Answer

Mass extinctions create new ecological opportunities by eliminating many species.

Question 20

A scientist is studying the evolutionary history of mammals using both morphological traits and DNA sequences. Which field of biology is she practicing?

Accepted Answer

Phylogenetics

Comprehensive Study Notes for College Biology: Genetics, Evolution, Ecology, and Physiology

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