Question 1

Which of the following best describes the difference between convergent evolution and homology?

Accepted Answer

Convergent evolution results in analogous structures due to similar selective pressures, while homology refers to traits inherited from a common ancestor.

Question 2

A population of beetles is in Hardy-Weinberg equilibrium for a gene with two alleles, $$A$$ and $$a. If $$the frequency of allele $$A is$$ $$0.7$$, what is the expected frequency of heterozygotes in the population?

Accepted Answer

$$0.42$$

Question 3

Which of the following is an example of a post-zygotic reproductive isolating mechanism?

Accepted Answer

Hybrid sterility

Question 4

A marine fish living in seawater must constantly drink water and excrete excess salts. Which adaptation best explains this strategy?

Accepted Answer

The fish is an osmoregulator, actively regulating internal osmolarity to maintain homeostasis.

Question 5

Which nitrogenous waste product is most energetically expensive to produce but allows for the greatest conservation of water?

Accepted Answer

Uric acid

Question 6

In the mammalian nephron, what is the primary function of the loop of Henle?

Accepted Answer

To create an osmotic gradient in the renal medulla, allowing for the production of concentrated urine

Question 7

Which hormone increases the permeability of the collecting duct to water, resulting in more concentrated urine?

Accepted Answer

Antidiuretic hormone (ADH)

Question 8

Which of the following best explains why birds excrete uric acid instead of urea or ammonia?

Accepted Answer

Uric acid is less toxic and can be stored as a solid, minimizing water loss in the egg.

Question 9

Which of the following statements about sexual and asexual reproduction is correct?

Accepted Answer

Sexual reproduction allows for greater genetic variation, which can enhance adaptability to changing environments.

Question 10

During the human ovarian cycle, what triggers the surge in luteinizing hormone (LH) that leads to ovulation?

Accepted Answer

A threshold level of estrogen causing positive feedback on the hypothalamus and pituitary

Question 11

Which of Tinbergen’s four questions is best addressed by studying how a behavior increases an animal’s reproductive success?

Accepted Answer

How does the behavior increase survival and reproduction?

Question 12

A researcher observes that a certain bird species learns to avoid eating monarch butterflies after becoming ill from eating one. This is an example of:

Accepted Answer

Associative learning (operant conditioning)

Question 13

Which of the following best describes the competitive exclusion principle?

Accepted Answer

Two species with identical niches cannot coexist indefinitely in the same habitat.

Question 14

In a logistic growth model, what happens to the population growth rate as the population size ($$N) $$approaches the carrying capacity ($$K$$)?

$$	ext{d}N/	ext{d}t = rN \left(1 - \frac{N}{K}ight)$$

Accepted Answer

The growth rate decreases and approaches zero.

Question 15

Which of the following is an example of Batesian mimicry?

Accepted Answer

A harmless king snake resembling a venomous coral snake

Question 16

Which of the following is a density-dependent factor that can regulate population size?

Accepted Answer

A contagious disease spreading more rapidly in crowded populations

Question 17

Which of the following is a primary goal of conservation biology?

Accepted Answer

To document biodiversity, investigate causes of loss, and develop practical solutions for conservation

Question 18

A population of frogs has the following age-specific survivorship and fecundity data:

Age 1: $$l_1 = 0.8$, m_1$ = 2$$
Age 2: $$l_2 = 0.5$, m_2$ = 3$$
Age 3: $$l_3 = 0.2$, m_3$ = 1$$

What is the net reproductive rate ($$R_0) $$for this population?

$$R_0$$ = \sum l_x m_x$$

Accepted Answer

$$3.1$$

Question 19

Which of the following best explains why keystone species are important in communities?

Accepted Answer

Their removal causes significant changes in community structure and diversity.

Question 20

Which of the following is a real-world example of reciprocal altruism?

Accepted Answer

A vampire bat sharing blood with another bat that has failed to feed, expecting the favor to be returned in the future

Comprehensive Study Guide: Evolution, Physiology, Reproduction, Behavior, and Ecology

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