Question 1

Which of the following best describes a synapomorphy, and why is it important in constructing phylogenetic trees?

Accepted Answer

A shared derived trait present in an ancestor and all its descendants, crucial for identifying evolutionary relationships.

Question 2

A researcher is comparing the limb bones of bats and whales. Both have similar bone structures, but use them for flying and swimming, respectively. This similarity is best explained by which concept?

Accepted Answer

Homology, because the structures are derived from a common ancestor.

Question 3

Which of the following is an example of deep homology?

Accepted Answer

The use of Hox genes to pattern body axes in both fruit flies and vertebrates.

Question 4

Which process is responsible for the formation of the nucleus and endoplasmic reticulum in eukaryotic cells, according to current hypotheses?

Accepted Answer

Infolding of the cell membrane in an archaeal ancestor.

Question 5

Which of the following best explains why polytomies appear in phylogenetic trees?

Accepted Answer

They represent uncertainty or insufficient data about the evolutionary relationships among lineages.

Question 6

A plant biologist is studying a species with dominant sporophyte generation, vascular tissue, seeds, and flowers. To which group does this plant most likely belong?

Accepted Answer

Angiosperma

Question 7

Which pigment is found in both green algae and land plants, and is essential for oxygenic photosynthesis?

Accepted Answer

Chlorophyll a

Question 8

Which of the following statements about fungal life cycles is correct?

Accepted Answer

In Basidiomycota, the basidium (2n) undergoes meiosis to produce four haploid spores.

Question 9

Which of the following best describes the evolutionary significance of the Wood-Ljungdahl pathway?

Accepted Answer

It is an ancient autotrophic pathway that may have been used by LUCA for carbon fixation.

Question 10

Which of the following is a synapomorphy of all Metazoa (animals)?

Accepted Answer

Multicellularity with differentiated cell types

Question 11

A mutation in a Hox gene results in the development of legs where antennae should be in a fruit fly. This is an example of:

Accepted Answer

Homeotic mutation

Question 12

Which of the following best explains the evolutionary advantage of heterospory in plants?

Accepted Answer

It separates male and female gametophyte development, reducing self-fertilization.

Question 13

Which of the following statements about mycorrhizal relationships is correct?

Accepted Answer

They are mutualistic associations where fungi enhance nutrient uptake for plants.

Question 14

Which of the following best describes the difference between a gametophyte-dominated and a sporophyte-dominated life cycle?

Accepted Answer

In gametophyte-dominated cycles, the haploid stage is multicellular and prominent; in sporophyte-dominated cycles, the diploid stage is multicellular and prominent.

Question 15

Which of the following is a key innovation that allowed plants to colonize land?

Accepted Answer

Evolution of cuticle and sporopollenin

Question 16

Which of the following best describes the role of morphogens in animal development?

Accepted Answer

They are signaling molecules that establish spatial patterns in tissues by forming concentration gradients.

Question 17

Which of the following is true regarding the difference between Lophotrochozoa and Ecdysozoa?

Accepted Answer

Ecdysozoa undergo ecdysis (molting), while Lophotrochozoa do not.

Question 18

Which of the following best explains why the Cambrian Explosion is significant in animal evolution?

Accepted Answer

It represents a rapid diversification of animal body plans and the origin of most major animal phyla.

Question 19

Which of the following is a correct statement about the alternation of generations in plants?

Accepted Answer

The gametophyte produces gametes by mitosis, and the sporophyte produces spores by meiosis.

Question 20

Which of the following best describes the evolutionary trend in fertilization among land plants?

Accepted Answer

A shift from water-dependent sperm to pollen-mediated fertilization.

Phylogeny, Evolution, and Major Lineages: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards