Question 1

Which of the following best describes the purpose of phylogenetics in biology?

Accepted Answer

To study the evolutionary relationships between organisms.

Question 2

A phylogenetic tree is constructed using several lines of evidence. Which of the following is NOT typically used as evidence?

Accepted Answer

Weather patterns

Question 3

In the Linnaean classification system, why is binomial nomenclature preferred over common names?

Accepted Answer

Binomial names are always unambiguous, while common names can be ambiguous.

Question 4

Which term describes a group that includes an ancestor and all of its descendants?

Accepted Answer

Monophyletic

Question 5

Occam’s razor is often used in building phylogenetic trees. What does it suggest?

Accepted Answer

The simplest solution tends to be the correct solution.

Question 6

If two species share a large number of homologous DNA sequences, what does this most likely indicate?

Accepted Answer

They are closely related evolutionarily.

Question 7

Which of the following is a real-world example of a monophyletic group?

Accepted Answer

All mammals, including humans, whales, and bats.

Question 8

A researcher is comparing DNA sequences from three species. Species 1 and Species 2 share more similarities than either does with Species 3. What is the most likely relationship?

Accepted Answer

Species 1 and Species 2 are more closely related to each other than to Species 3.

Question 9

Which of the following best describes a polyphyletic group?

Accepted Answer

A group that includes species from multiple ancestors but not all descendants.

Question 10

Why are branch lengths in cladograms usually arbitrary?

Accepted Answer

Cladograms focus on relationships, not time or genetic distance.

Question 11

Which of the following is a critical step in building a phylogenetic tree using Occam’s razor?

Accepted Answer

Sorting differences to find the simplest solution.

Question 12

A scientist is using the fossil record to build a phylogenetic tree. What is the main advantage of this approach?

Accepted Answer

It provides direct evidence of evolutionary history.

Question 13

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

Accepted Answer

Reptiles excluding birds.

Question 14

In a phylogram, what does branch length typically represent?

Accepted Answer

Time or genetic distance.

Question 15

Which of the following would be considered a homologous structure?

Accepted Answer

The forelimbs of humans, whales, and bats.

Question 16

Why is it important to use both morphological and molecular evidence when constructing phylogenetic trees?

Accepted Answer

Combining evidence increases accuracy and resolves ambiguities.

Question 17

Which of the following statements about binomial nomenclature is correct?

Accepted Answer

It consists of a genus and species name, often in Latin.

Question 18

A phylogenetic tree shows that two bird species share a recent common ancestor. What does this imply about their evolutionary relationship?

Accepted Answer

They are closely related and likely share many traits.

Question 19

Which of the following is a practical application of phylogenetic trees in medicine?

Accepted Answer

Tracing the evolutionary origins of pathogens.

Question 20

Given the DNA sequences below, which two species are most closely related?

Species A: ATCGGTA
Species B: ATCGGTT
Species C: ATCCGTA

Accepted Answer

Species A and Species B

Phylogeny and Cladistics: Lecture 1

Study Guide - Practice Questions

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