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, indicating evolutionary relationships.

Question 2

A researcher is comparing the wings of bats and birds. Both structures are used for flight but evolved independently. Which term best describes this similarity, and what evolutionary process does it illustrate?

Accepted Answer

Homoplasy; convergent evolution

Question 3

Which of the following is a correct sequence of events in the evolution of eukaryotic cells according to the endosymbiotic theory?

Accepted Answer

Infolding of cell membrane to form nucleus → Endosymbiosis of aerobic heterotrophic prokaryote → Endosymbiosis of cyanobacteria

Question 4

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

Accepted Answer

The sporophyte is diploid and produces haploid spores by meiosis.

Question 5

A scientist discovers a fossilized plant with vascular tissue, seeds, but no flowers. To which group does this plant most likely belong?

Accepted Answer

Gymnosperma

Question 6

Which of the following best explains why the presence of sporopollenin was a key adaptation for the colonization of land by plants?

Accepted Answer

It provided resistance to desiccation for spores and pollen.

Question 7

Which of the following is a distinguishing feature of Basidiomycota in their sexual life cycle?

Accepted Answer

Production of 4 haploid spores on a basidium

Question 8

A multicellular animal with bilateral symmetry, three embryonic tissue layers, and a body cavity that forms from the splitting of mesoderm is most likely a:

Accepted Answer

Triploblastic protostome

Question 9

Which of the following best describes the role of Hox genes in animal development?

Accepted Answer

They regulate the expression of other genes, determining body plan and segment identity.

Question 10

Which of the following is an example of deep homology?

Accepted Answer

The presence of flagellated gametes in both fungi and animals due to shared ancestral genes.

Question 11

A polytomy in a phylogenetic tree most likely indicates:

Accepted Answer

Uncertainty or lack of sufficient data to resolve the branching order among lineages.

Question 12

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

Accepted Answer

Homology refers to traits inherited from a common ancestor, while homoplasy refers to traits that arise independently in different lineages.

Question 13

Which of the following is a key synapomorphy of the Archaeplastida lineage?

Accepted Answer

Primary endosymbiosis of a cyanobacterium leading to chloroplasts

Question 14

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 15

Which of the following is a correct description of the Wood-Ljungdahl pathway?

Accepted Answer

A chemoautotrophic pathway for carbon fixation in some early prokaryotes.

Question 16

Which of the following statements about mycorrhizal relationships is correct?

Accepted Answer

They are mutualistic, with fungi aiding plant nutrient uptake in exchange for carbohydrates.

Question 17

Which of the following best describes the difference between a node and a tip in a phylogenetic tree?

Accepted Answer

A node represents a common ancestor, while a tip represents an extant or extinct species.

Question 18

Which of the following is a function of regulatory transcription factors in developmental genetics?

Accepted Answer

They bind to DNA and influence the expression of target genes during development.

Question 19

Which of the following is a characteristic of the haploid-dominant life cycle found in some algae and fungi?

Accepted Answer

The multicellular organism is haploid, and the diploid stage is limited to the zygote.

Question 20

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.

Phylogeny, Evolution, and Major Lineages: Study Notes

Study Guide - Practice Questions

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