Q: A population of beetles has the following allele frequencies: $$p = 0.7$$ for the dominant allele and $$q = 0.3$$ for the recessive allele. According to the Hardy-Weinberg equation $$p^2 + 2pq$$ + $$q^2 = 1$, what is the expected frequency of heterozygous individuals?

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

Question 1

Which of the following best explains how the structure of alveoli in the lungs relates to their function in the respiratory system?

Accepted Answer

Alveoli have thin, moist walls and a large surface area to maximize gas exchange with capillaries.

Question 2

A patient has a genetic disorder caused by a nondisjunction event during meiosis. Which of the following best describes what happened during gamete formation?

Accepted Answer

Homologous chromosomes failed to separate, resulting in gametes with an abnormal number of chromosomes.

Question 3

Which of the following scenarios best illustrates the concept of incomplete dominance?

Accepted Answer

A cross between a red-flowered plant (RR) and a white-flowered plant (WW) produces all pink-flowered offspring (RW).

Question 4

Which of the following best describes the Central Dogma of Biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 5

A population of beetles has the following allele frequencies: $$p = 0.7$$ for the dominant allele and $$q = 0.3$$ for the recessive allele. According to the Hardy-Weinberg equation $$p^2 + 2pq$$ + $$q^2 = 1$, what is the expected frequency of heterozygous individuals?

Accepted Answer

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

Question 6

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

Accepted Answer

A contagious disease spreads more rapidly as population density increases.

Question 7

Which process during meiosis increases genetic variation by exchanging segments between homologous chromosomes?

Accepted Answer

Crossing over during prophase I

Question 8

A person with type AB blood has both A and B antigens on their red blood cells. Which pattern of inheritance does this illustrate?

Accepted Answer

Codominance

Question 9

Which of the following best explains why more males than females are affected by X-linked recessive disorders?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will cause the disorder.

Question 10

Which of the following best describes the role of decomposers in the nitrogen cycle?

Accepted Answer

They break down dead organisms, releasing ammonia into the soil.

Question 11

A scientist observes that two species of frogs breed at different times of the year, preventing them from interbreeding. Which type of reproductive isolation is this?

Accepted Answer

Temporal isolation

Question 12

Which of the following is a correct sequence for the movement of oxygen from the environment to body cells in humans?

Accepted Answer

Nasal cavity → trachea → bronchi → alveoli → blood → body cells

Question 13

Which of the following best describes the competitive exclusion principle?

Accepted Answer

No two species can occupy the same niche in the same habitat at the same time.

Question 14

Which of the following is a real-world example of biomagnification?

Accepted Answer

Mercury concentrations increase in fish-eating birds at the top of the aquatic food chain.

Question 15

Which of the following best explains why sexual reproduction increases the fitness of a population?

Accepted Answer

It introduces genetic variation, allowing populations to adapt to changing environments.

Question 16

Which of the following is a correct interpretation of the 10% rule in ecological energy transfer?

Accepted Answer

Only 10% of the energy at one trophic level is passed to the next level.

Question 17

A mutation changes the DNA sequence from $$TAC to$$ $$TAG. $$How might this affect the resulting protein?

Accepted Answer

It could introduce a premature stop codon, resulting in a shortened protein.

Question 18

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable trait.

Question 19

Which of the following is a function of the enzyme DNA polymerase during DNA replication?

Accepted Answer

Adding complementary nucleotides to the growing DNA strand

Question 20

Which of the following best explains how the founder effect can influence evolution in a small population?

Accepted Answer

A small group colonizes a new area, and their allele frequencies differ from the original population.

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