Question 1

Which of the following best describes the main goal of systematics in biology?

Accepted Answer

To group and classify organisms based on their evolutionary relationships.

Question 2

In the Linnean hierarchy, which taxonomic level is immediately broader than 'Family'?

Accepted Answer

Order

Question 3

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

Accepted Answer

$$Panthera\ leo$$

Question 4

A phylogenetic tree is most similar in concept to which of the following?

Accepted Answer

A family tree

Question 5

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

Accepted Answer

The last common ancestor of the taxa that branch from that point

Question 6

Which of the following statements about clades is correct?

Accepted Answer

A clade includes an ancestor and all of its descendants.

Question 7

If two species are sister taxa on a phylogenetic tree, what does this indicate?

Accepted Answer

They share an immediate common ancestor not shared by any other group.

Question 8

Which of the following is a shared derived character (synapomorphy) for mammals?

Accepted Answer

Mammary glands

Question 9

Why is an outgroup included when constructing a phylogenetic tree?

Accepted Answer

To help determine which traits are ancestral and which are derived

Question 10

Which of the following best describes the principle of maximum parsimony in phylogenetic analysis?

Accepted Answer

The simplest explanation with the fewest evolutionary changes is preferred.

Question 11

Which group is considered paraphyletic?

Accepted Answer

A group that includes a common ancestor and some, but not all, of its descendants.

Question 12

Which of the following is a challenge when using a molecular clock to date evolutionary events?

Accepted Answer

Mutation rates can vary among different lineages.

Question 13

Which of the following statements about homologous genes is true?

Accepted Answer

Orthologs are homologous genes found in different species.

Question 14

Which of the following is an example of a polyphyletic group?

Accepted Answer

A group that does not include the most recent common ancestor of its members.

Question 15

In a phylogenetic tree where branch length represents the amount of genetic change, what does a shorter branch indicate?

Accepted Answer

Fewer genetic changes have occurred.

Question 16

Which of the following is a reason why 'protists' are not considered a single kingdom in modern classification?

Accepted Answer

Protists are a polyphyletic group.

Question 17

Which of the following statements about binomial nomenclature is correct?

Accepted Answer

The genus name is capitalized and both genus and species are italicized.

Question 18

Which of the following is the most informative nucleotide for distinguishing between three taxa in a character matrix?

Accepted Answer

A nucleotide that is different in at least one taxon compared to the others.

Question 19

Which of the following best describes a shared ancestral character?

Accepted Answer

A trait that was present in the ancestor of the group and is shared by all descendants.

Question 20

Why is parsimony useful in constructing phylogenetic trees?

Accepted Answer

It minimizes the number of evolutionary changes required to explain the data.

Systematics and Phylogeny: Seeking Order Amid Diversity

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