Question 1

Which of the following best describes the purpose of binomial nomenclature in biological classification?

Accepted Answer

To provide a unique, universally accepted scientific name for each species, reducing confusion caused by common names.

Question 2

In the Linnaean system, which of the following sequences correctly orders the taxonomic categories from most inclusive to least inclusive?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 3

A phylogenetic tree is best described as:

Accepted Answer

A hypothesis about the evolutionary relationships among a group of organisms.

Question 4

Which of the following statements about phylogenetic trees is FALSE?

Accepted Answer

The order of taxa at the tips of the tree indicates the sequence of evolutionary events.

Question 5

In Figure 26.3, which taxonomic level immediately groups together the North American beaver (Castor canadensis) and the Eurasian beaver (Castor fiber)?

Accepted Answer

Genus

Question 6

If a DNA sample from a suspected poached animal matches most closely with a protected whale species in a gene tree, what does this imply?

Accepted Answer

The animal was likely harvested illegally.

Question 7

Which of the following is an example of a sister taxon relationship?

Accepted Answer

Chimpanzees and humans sharing an immediate common ancestor not shared by any other group.

Question 8

Why might systematists reclassify an organism after new DNA evidence is discovered?

Accepted Answer

Because the organism may have been misclassified based on morphological features alone.

Question 9

Which of the following is NOT a correct interpretation of a phylogenetic tree?

Accepted Answer

The length of branches always indicates the amount of evolutionary change.

Question 10

A researcher rotates a phylogenetic tree around a branch point. What changes in the evolutionary relationships depicted?

Accepted Answer

Nothing; the relationships remain the same.

Question 11

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

Accepted Answer

A lineage that diverges early and lies on a branch close to the common ancestor of the group.

Question 12

Which of the following is a practical application of phylogenetic analysis in wildlife conservation?

Accepted Answer

Identifying illegally harvested animal products using DNA sequences.

Question 13

If all whale meat samples in a market matched the mtDNA of Southern Hemisphere Minke whales, what would this indicate?

Accepted Answer

All the meat was harvested legally.

Question 14

Which of the following is true regarding the Linnaean system of classification?

Accepted Answer

Taxa broader than genus are capitalized but not italicized.

Question 15

A student claims that humans evolved from chimpanzees because they are next to each other on a phylogenetic tree. Why is this incorrect?

Accepted Answer

Phylogenetic trees show patterns of descent, not direct ancestry between neighboring taxa.

Question 16

Which of the following best explains why common names can be problematic in scientific communication?

Accepted Answer

Common names can refer to multiple species and vary by language.

Question 17

A gene tree is constructed using mtDNA sequences from several whale meat samples. If some samples cluster with protected species, what is the most likely conclusion?

Accepted Answer

Some of the meat was obtained from protected, illegally harvested whales.

Question 18

Which of the following is an example of hierarchical classification?

Accepted Answer

Grouping squirrels and beavers into the same order but different families.

Question 19

Which of the following is a correct statement about the relationship between classification and phylogeny?

Accepted Answer

Classification should ideally reflect evolutionary relationships among organisms.

Question 20

Suppose a new species is discovered that shares a recent common ancestor with rats but not with beavers or squirrels. According to the Linnaean system, which taxonomic level would this new species most likely share with rats?

Accepted Answer

Family

Phylogenies and Evolutionary Relationships: Classification, Trees, and Applications

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