Question 1

Which of the following best describes a vestigial structure, and why is it significant in evolutionary biology?

Accepted Answer

A structure inherited from ancestors that serves no apparent purpose in the modern organism, providing evidence for descent with modification.

Question 2

Which scientist developed the principle of uniformitarianism, and what was its impact on evolutionary theory?

Accepted Answer

Charles Lyell; it demonstrated that the Earth is exceedingly old and shaped by gradual, ongoing geological processes.

Question 3

According to Darwin’s Four Postulates, which scenario best illustrates Postulate 4: 'Survival and reproduction are not determined by chance'?

Accepted Answer

Individuals with traits that confer an advantage in their environment are more likely to survive and reproduce.

Question 4

Why does Mendelian genetics, rather than blended inheritance, allow for the persistence of variation necessary for evolution?

Accepted Answer

Because alleles remain discrete and can reappear in future generations, maintaining variation.

Question 5

A population of insects exposed to a new pesticide quickly develops resistance. Which Darwinian postulate does this scenario most directly illustrate, and why?

Accepted Answer

Postulate 1: Individuals in a population vary; random mutations may confer resistance, and those individuals survive.

Question 6

Which of the following is an example of a homologous structure, and what does it reveal about evolutionary relationships?

Accepted Answer

The internal bone structure of a human arm and a chicken wing; they share evolutionary origin despite different functions.

Question 7

In the case of the Silent Crickets of Kauai, which evolutionary mechanism led to the rapid dominance of the silent phenotype?

Accepted Answer

Natural selection favored crickets with a mutation for silent wings because they avoided parasitic flies and reproduced more successfully.

Question 8

Which statement best explains why it is scientifically inaccurate to say that plants 'developed resistance because they needed it'?

Accepted Answer

Mutations occur randomly; plants with pre-existing resistance survive and reproduce, but need does not cause mutations.

Question 9

Which of the following best describes convergent evolution, and which anatomical evidence supports it?

Accepted Answer

Different species evolve similar structures with different internal anatomy and origin, as seen in analogous structures.

Question 10

Which real-world example best demonstrates artificial selection, and how does it relate to Darwin’s Postulate 2?

Accepted Answer

Humans selectively breed dogs for specific traits, showing that desired characteristics are inherited from parent to offspring.

Question 11

Which equation represents the expected genotype frequencies in a population under Mendelian inheritance for a cross between two heterozygotes ($$Aa 	imes Aa$$)?

Accepted Answer

$$1AA : 2Aa : 1aa$$

Question 12

Which of the following is NOT a line of evidence supporting the theory of evolution?

Accepted Answer

The belief that all species are static and divinely created.

Question 13

During early development, all vertebrate embryos exhibit certain features. Which features are these, and what do they indicate?

Accepted Answer

A tail and gill slits, indicating shared ancestry among vertebrates.

Question 14

Which scientist is credited with proposing the (now refuted) theory of inheritance of acquired characteristics, and what was the main flaw in this theory?

Accepted Answer

Jean-Baptiste Lamarck; it incorrectly assumed that traits changed by use or disuse during an organism’s lifetime could be passed to offspring.

Question 15

A population of birds is exposed to a new predator. Over several generations, birds with longer wings survive more often. Which postulate(s) of Darwin’s theory does this scenario illustrate? Select the best answer.

Accepted Answer

Postulate 1 and 4: Variation exists and survival is non-random based on wing length.

Question 16

Which of the following best explains why extreme phenotypes (e.g., AA or aa) are not eliminated in Mendelian inheritance?

Accepted Answer

Because alleles segregate independently and can recombine to produce extreme phenotypes in subsequent generations.

Question 17

Which of the following is an example of a scenario where natural selection is accelerated by human activity?

Accepted Answer

The rapid evolution of herbicide-resistant weeds due to widespread chemical use.

Question 18

Which concept is illustrated by the fact that all known organisms use DNA, RNA, ribosomes, the same 20 amino acids, and ATP?

Accepted Answer

The molecular record, indicating universal common ancestry.

Question 19

Which equation best represents the Hardy-Weinberg equilibrium for allele frequencies in a population, assuming no evolutionary forces are acting?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Principles of Evolution: Study Guide and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards