Question 1

Which of the following best describes a monophyletic group in cladistics?

Accepted Answer

A group that includes an ancestor and all of its descendants

Question 2

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

Accepted Answer

$$Homo sapiens$$

Question 3

A scientist is comparing the DNA sequences of two species to infer their evolutionary relationship. She finds that the number of nucleotide substitutions between them is proportional to the time since they shared a common ancestor. What concept is she applying?

Accepted Answer

Molecular clock

Question 4

Which of the following statements about homologous and analogous structures is correct?

Accepted Answer

Homologous structures are similar due to shared ancestry

Question 5

A phylogenetic tree shows branch lengths proportional to the number of genetic changes. If lineage A has a branch length twice as long as lineage B, what does this indicate?

Accepted Answer

Lineage A has experienced twice as many genetic changes as lineage B

Question 6

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

Accepted Answer

Hair

Question 7

Why might molecular clocks not always run smoothly, potentially leading to inaccurate estimates of evolutionary divergence?

Accepted Answer

Natural selection can favor some DNA changes over others

Question 8

Which hierarchical taxonomic rank is immediately above genus?

Accepted Answer

Family

Question 9

A researcher is constructing a phylogenetic tree using the principle of maximum parsimony. What is she trying to achieve?

Accepted Answer

A tree that requires the fewest evolutionary events

Question 10

Which of the following best explains why birds are included in the clade Reptilia in modern classification?

Accepted Answer

Birds evolved from a group of reptiles and share a common ancestor

Question 11

If a taxonomist places species together based on similar traits but ignores evolutionary history, what is a potential problem with this approach?

Accepted Answer

It may group together species that are not closely related

Question 12

Which of the following is a polyphyletic group?

Accepted Answer

A group that includes distantly related species but not their most recent common ancestor

Question 13

A scientist finds that two distantly related organisms share a similar DNA sequence by chance. What statistical tool can help distinguish between coincidental matches and true homology?

Accepted Answer

Sequence alignment algorithms

Question 14

Which of the following is NOT a processing skill emphasized in biological classification and phylogeny?

Accepted Answer

Replication of DNA

Question 15

Which of the following would be considered a basal taxon in a phylogenetic tree?

Accepted Answer

A taxon that diverged early and is closely related to the root of the tree

Question 16

Which of the following is an example of a neutral mutation?

Accepted Answer

A mutation that has little or no effect on fitness

Question 17

Why are molecular homologies important in constructing phylogenetic trees?

Accepted Answer

They provide evidence of shared ancestry through DNA sequence similarity

Question 18

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

Accepted Answer

It selects the tree that is most probable given a specific model of DNA sequence evolution

Question 19

A scientist is using an outgroup to help root a phylogenetic tree. What is the main purpose of the outgroup?

Accepted Answer

To serve as a basal taxon for comparison

Question 20

Which of the following is a real-world application of phylogenetic analysis?

Accepted Answer

Determining the evolutionary origin of HIV by comparing viral sequences from humans and chimpanzees

Phylogeny, Systematics, and Classification: Study Notes for General Biology

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