In this chapter's "Focus on Globalization" section, scientists trace the global spread of anatomically modern humans by constructing a global phylogenetic tree based on mtDNA (mitochondrial DNA). What have we learned from this tree?
A. Modern humans spread out of Africa over a million years ago.
B. There was only one wave of migration into North and South America.
C. The Ice Age temporarily halted early human migrations.
D. The Americas were settled by multiple haplogroups rather than by a single ancestral population.
E. Human migrations were not influenced by global climate change.
Answer: D
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When the heterozygote is at a selective advantage in an environment, the population can exist in a state of relative stability known as a(n) __________
A. random drift spike B. balanced polymorphism C. polytypic unit D. acclimatization period
Genocides have occurred in all of the following countries EXCEPT:
a. Rwanda. b. Sudan. c. Germany. d. Yugoslavia. e. Iceland.
Bands have formal leadership, although it changes when necessary
a. True b. False
If a Trobriand girl’s parents approve her marriage:
a) they bring cooked yams to her at her boyfriend’s house. b) they are required to slaughter a big and hold a feast. c) they arrange a community-wide feast. d) they perform a series of songs addressed to the couple.