Question 1

Which of the following statements best describes the difference between homology and analogy in evolutionary biology?

Accepted Answer

Homology refers to similarities due to shared ancestry, while analogy refers to similarities due to convergent evolution.

Question 2

A phylogenetic tree shows that both snakes and glass lizards lack limbs. Based on the concept of convergent evolution, what is the most likely explanation for this similarity?

Accepted Answer

The loss of limbs occurred independently in both lineages due to similar environmental pressures.

Question 3

Which of the following is the correct order of taxonomic ranks from broadest to most specific?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 4

Why might a phylogenetic tree based on rRNA genes show a different relationship among domains than a tree based on other genes?

Accepted Answer

Horizontal gene transfer can cause different genes to have different evolutionary histories.

Question 5

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

Accepted Answer

A group that includes an ancestral species and all of its descendants.

Question 6

A researcher is comparing DNA sequences between two species. Which of the following would most likely indicate that the sequences are homologous?

Accepted Answer

The sequences share many identical or similar nucleotide positions, especially in complex regions.

Question 7

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

Accepted Answer

Maximum parsimony, which favors the tree with the fewest evolutionary changes.

Question 8

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

Accepted Answer

Hair, which is unique to mammals and not found in their ancestors.

Question 9

Which of the following statements about molecular clocks is correct?

Accepted Answer

A molecular clock estimates the time of evolutionary change based on the assumption that some genes evolve at a constant rate.

Question 10

Which of the following scenarios best illustrates the use of phylogenetic bracketing?

Accepted Answer

Predicting that dinosaurs built nests and cared for their eggs because both birds and crocodiles share these traits.

Question 11

Which of the following is a potential problem when using molecular clocks to estimate evolutionary divergence times?

Accepted Answer

The rate of molecular change may not be constant across all genes or lineages.

Question 12

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

Accepted Answer

A bacterium acquiring a gene from a virus that infects it.

Question 13

Why is it important to distinguish between shared ancestral and shared derived characters when constructing a phylogenetic tree?

Accepted Answer

Shared derived characters help identify evolutionary relationships unique to particular clades.

Question 14

Which of the following best describes an orthologous gene?

Accepted Answer

A gene found in different species that originated from a common ancestor due to a speciation event.

Question 15

A group of researchers is using DNA sequence data to infer the evolutionary relationships among several species. Which of the following steps should they take first?

Accepted Answer

Align comparable DNA sequences from all study species.

Question 16

Which of the following is true about the three-domain system of classification?

Accepted Answer

It groups all life into Bacteria, Archaea, and Eukarya based on molecular and cellular differences.

Question 17

Which of the following is a reason why gene number does not always correlate with organismal complexity?

Accepted Answer

Many human genes can encode multiple proteins with different functions.

Question 18

Which of the following is a correct statement about the use of outgroups in phylogenetic analysis?

Accepted Answer

Outgroups help determine which characters are ancestral within the ingroup.

Question 19

Which of the following best explains why the order of taxa at the tips of a phylogenetic tree is not significant?

Accepted Answer

The branching pattern, not the order of tips, shows the evolutionary relationships.

Phylogeny and the Tree of Life: Study Notes

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