Question 1

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

Accepted Answer

A group that contains a common ancestor and all its descendants.

Question 2

In binomial nomenclature, which of the following is the correct way to write the scientific name for the domestic cat?

Accepted Answer

$	extit{Felis catus}$

Question 3

A researcher is comparing DNA sequences between two species to estimate the time since their divergence. Which concept is being applied?

Accepted Answer

Molecular clock

Question 4

Which of the following scenarios is an example of horizontal gene transfer?

Accepted Answer

A bacterium acquires antibiotic resistance genes from another bacterium via plasmid exchange.

Question 5

Which of the following traits in the provided phylogenetic tree is a shared derived character (apomorphy) for the Family Felidae?

Accepted Answer

Ability to purr

Question 6

Why do taxonomists prefer monophyletic groups over paraphyletic or polyphyletic groups?

Accepted Answer

Monophyletic groups accurately reflect evolutionary relationships by including all descendants of a common ancestor.

Question 7

Which principle is used to select the best phylogenetic tree when multiple trees are possible?

Accepted Answer

Principle of parsimony

Question 8

A group of animals is defined by the presence of hair, but not all members possess the ability to purr. What type of group is this?

Accepted Answer

Paraphyletic group

Question 9

Which of the following is an example of convergent evolution?

Accepted Answer

Wings in bats and wings in birds, which evolved independently.

Question 10

If a neutral mutation occurs in a population, what is most likely to happen over time?

Accepted Answer

It may spread through the population by genetic drift.

Question 11

Which taxonomic rank is immediately higher than 'Family'?

Accepted Answer

Order

Question 12

A trait that is present in both turtles and horses, but not in leopards or domestic cats, is most likely a:

Accepted Answer

Shared ancestral character (plesiomorphy)

Question 13

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

Accepted Answer

Homology refers to traits inherited from a common ancestor, while analogy refers to traits that evolved independently due to similar selection pressures.

Question 14

If a molecular clock estimates a divergence of 2 million years between two species, but the fossil record suggests 1 million years, what could explain this discrepancy?

Accepted Answer

Variation in mutation rates or generation times between species.

Question 15

Which of the following is NOT a mechanism of horizontal gene transfer?

Accepted Answer

Mutation during DNA replication in a single organism.

Question 16

Which equation would you use to estimate the time since divergence between two species using molecular clock data?

Accepted Answer

$T = \frac{D}{2r}$, where $T$ is time since divergence, $D$ is genetic distance, and $r$ is mutation rate per generation.

Question 17

Which of the following would most likely complicate the construction of a phylogenetic tree based on morphological traits?

Accepted Answer

Convergent evolution resulting in homoplasies.

Question 18

Which domain includes organisms with membrane-bound nuclei?

Accepted Answer

Eukarya

Question 19

A cladogram constructed using gene sequences shows a mutation present in all members of a clade except one. What is the most parsimonious explanation?

Accepted Answer

The mutation was lost in the lineage leading to the exceptional member.

Question 20

Which of the following best defines a sister group in phylogenetics?

Accepted Answer

A monophyletic lineage most closely related to the lineage being discussed.

Taxonomy and Systematics: Understanding Biological Diversity

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