Question 1

Which of the following best explains why mutations are important for long-term evolutionary processes?

Accepted Answer

Mutations introduce new genetic variation, which can lead to phenotypic diversity and provide raw material for evolution over many generations.

Question 2

Arrange the following taxonomic categories in order from smallest (most specific) to largest (most inclusive): Family, Order, Genus, Class, Species.

Accepted Answer

Species, Genus, Family, Order, Class

Question 3

Why do biologists prefer binomial nomenclature over common names when classifying organisms?

Accepted Answer

Common names can vary by region and language, while binomial nomenclature provides a universal, standardized system for identifying species.

Question 4

Which of the following statements about phylogenetic trees is correct?

Accepted Answer

A phylogenetic tree is a hypothesis that represents our best estimate of evolutionary relationships, which may change with new evidence.

Question 5

In a phylogenetic tree, what does a node (branch point) represent?

Accepted Answer

A node represents the most recent common ancestor of the descendant taxa.

Question 6

Which of the following best distinguishes a monophyletic group from a non-monophyletic group?

Accepted Answer

A monophyletic group includes all descendants of a common ancestor, while a non-monophyletic group does not.

Question 7

Which of the following is an example of a shared derived trait (synapomorphy)?

Accepted Answer

The presence of feathers in birds, which is not found in their ancestors or other groups.

Question 8

How does maximum parsimony assist systematists in constructing phylogenetic trees?

Accepted Answer

It selects the tree that requires the fewest evolutionary changes to explain the observed data.

Question 9

Which of the following best describes the difference between homology and analogy?

Accepted Answer

Homology refers to traits that are similar due to shared ancestry, while analogy refers to traits that are similar due to convergent evolution.

Question 10

A researcher is comparing DNA sequences from four species to construct a phylogenetic tree. According to the 'rule of thumb,' which pair of species is likely to be most closely related?

Accepted Answer

The pair with the fewest differences in their DNA sequences.

Question 11

Which of the following is a correct way to write the scientific name for humans using binomial nomenclature?

Accepted Answer

$$	extit{Homo sapiens}$$

Question 12

Which domains are prokaryotic?

Accepted Answer

Bacteria and Archaea

Question 13

Horizontal gene transfer can complicate the construction of phylogenetic trees because:

Accepted Answer

It causes genes to move between unrelated lineages, making evolutionary relationships less clear.

Question 14

Which of the following is an example of a silent (neutral) mutation?

Accepted Answer

A mutation that does not change the amino acid sequence due to the redundancy of the genetic code.

Question 15

Which of the following statements about the five-kingdom system is correct?

Accepted Answer

It is no longer recognized because molecular data revealed that some kingdoms are not monophyletic.

Question 16

Given the following character matrix, which group is most likely monophyletic?

Species A: 0 0 0
Species B: 1 0 0
Species C: 1 1 0
Species D: 1 1 1

(1 = presence of trait, 0 = absence of trait)

Accepted Answer

Species B, C, and D

Question 17

Which of the following best describes a basal taxon in a phylogenetic tree?

Accepted Answer

A taxon that diverged early and remains unbranched, representing an early lineage.

Question 18

Why is convergent evolution important to consider when constructing phylogenies?

Accepted Answer

It can result in analogous traits that appear similar but are not due to shared ancestry.

Question 19

Which of the following is NOT a goal of the hierarchical classification system?

Accepted Answer

To group organisms solely by their ecological roles.

Question 20

A phylogenetic tree shows that mammals and birds both have four limbs. What is the most likely explanation for this trait?

Accepted Answer

It is a shared ancestral trait inherited from a common ancestor.

Chapter 20: Phylogeny and the Tree of Life – Study Guide and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards