Question 1

Which of the following best describes a monophyletic group (clade) in a phylogenetic tree?

Accepted Answer

A group that includes an ancestor and all of its descendants.

Question 2

In the binomial nomenclature system, which part of the name 'Panthera pardus' refers to the genus?

Accepted Answer

'Panthera'

Question 3

Which of the following statements about phylogenetic trees is TRUE?

Accepted Answer

Branch points (internal nodes) represent the most recent common ancestors of descendant taxa.

Question 4

A group of organisms is defined as 'reptiles' (excluding birds) in traditional taxonomy. According to modern phylogenetics, this group is:

Accepted Answer

Paraphyletic

Question 5

Which of the following is the correct hierarchical order from broadest to most specific for the leopard (Panthera pardus)?

Accepted Answer

Family \u003e Genus \u003e Species

Question 6

What is the main goal of systematics in biology?

Accepted Answer

To study the diversity of life and infer evolutionary relationships among organisms.

Question 7

Which of the following best explains why molecular sequence data (such as DNA) is useful in phylogenetic analysis?

Accepted Answer

It provides character states that can be aligned and compared across species.

Question 8

In cladistic reasoning, which type of character state is most informative for inferring evolutionary relationships?

Accepted Answer

Shared derived states

Question 9

A group that does NOT include its own most recent common ancestor is called:

Accepted Answer

Polyphyletic

Question 10

Which method is commonly used to infer the best phylogenetic tree by minimizing the total number of evolutionary changes?

Accepted Answer

Parsimony

Question 11

If two unrelated species independently evolve similar traits due to similar environmental pressures, this is an example of:

Accepted Answer

Convergent evolution

Question 12

Which of the following is an example of a shared derived character (synapomorphy) in mammals?

Accepted Answer

Presence of hair

Question 13

Given the following DNA site alignment for four species:

Species W: G T A C
Species X: G T A C
Species Y: G T A T
Species Z: G T A T

How many evolutionary changes must have occurred at this site?

Accepted Answer

$$1$$

Question 14

Why do most biologists today believe that taxonomy should reflect phylogeny?

Accepted Answer

Because evolutionary relationships provide a natural basis for classification.

Question 15

Which of the following best distinguishes a phylogram from a cladogram?

Accepted Answer

A phylogram shows branch lengths proportional to the amount of evolutionary change.

Question 16

In a character matrix, the outgroup is used to:

Accepted Answer

Determine which character states are derived and which are ancestral.

Question 17

Which of the following scenarios would most likely result in a reversal in a phylogenetic analysis?

Accepted Answer

A derived character state is lost, returning to the ancestral state.

Question 18

Which of the following is NOT a reason why character state distributions might not be consistent with a single phylogenetic tree?

Accepted Answer

Shared derived characters

Question 19

A researcher is comparing DNA sequences from several bat viruses and SARS-CoV-2. What type of data is being used to infer their evolutionary relationships?

Accepted Answer

Molecular sequence data

Question 20

Which of the following statements about gene phylogenies is correct?

Accepted Answer

Gene phylogenies can trace the history of gene duplication and endosymbiotic events.

Phylogenetics & Systematics: Taxonomy, Phylogenetic Trees, and Evolutionary Relationships

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