Identities are
A. fixed by both genotype and phenotype.
B. creative constructs and therefore of little real consequence.
C. never dependent on context.
D. not fixed; they are fluid and multiple.
E. fictions.
Answer: D
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As an initial change from the Neolithic period, researchers found that high crop yields, resulting from agricultural innovations:
a. made more protein available so the brain could expand. b. provided more food for people, beginning an obesity epidemic. c. contributed to high populations densities in ancient civilizations. d. freed up people to become involved with trade speculation. e. allowed large empires to obtain global dominance.
Exogamy is adaptive because it
A. increases the number of individuals that one can rely upon in times of need. B. increases the likelihood that disadvantageous alleles will find phenotypic expression and eliminate them from the population. C. impedes peaceful relations among social groups and therefore promotes population expansion. D. was an important causal factor in the origin of the state. E. reduces the gene pool of a community.
There were three separate centers of domestication in China—one in the north, one in the south, and one on the eastern coast
Indicate whether the statement is true or false.
Sex-linked traits
a. have their loci on all chromosomes. b. are expressed more often in females than in males. c. are expressed in females in the same fashion as autosomal traits. d. are carried mainly on the Y chromosome. e. includes albinism.