Question 1

The most direct hominid ancestor to Homo sapiens is called ________.

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Question 2

The concept of gene flow indicates that evolution of populations can occur when individuals enter or leave a population. The addition of new alleles into the population makes it easy to visualize changes to phenotypes. Explain how emigration can lead to evolutionary change.

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Question 3

According to the modern theories on how life formed on Earth, prokaryotes are thought to have evolved before eukaryotes. Provide evidence to support that pattern of evolution based on the composition of the early Earth's atmosphere.

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Question 4

________ was an early human ancestor thought to be among the first tool makers.

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Question 5

As geographically isolated human subpopulations became adapted to different environments over time, different phenotypes resulted, causing the evolution of various human ________.

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Question 6

The process of producing energy from organic substrates in the absence of oxygen is called ________ metabolism.

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Question 7

All humans are classified as Homo sapiens, a single species. But you know from looking around you that all people do not look or sound the same. Explain how it is possible for humans to belong to the same species yet display a wide range of physical differences.

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Question 8

Humans are classified as ________ because of our larger bodies, bigger brains, and lack of tails in relation to other primates.

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Question 9

Racial differences most likely arose as adaptations to different ________.

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Quiz 22: Evolution and the Origins of Life