Natural selection is defined as:
A. an evolutionary process in which a small group of individuals account for all of the genetic variation in a large population.
B. a process whereby species share phenotypic characteristics due to recent common ancestry.
C. an evolutionary process whereby species come to share phenotypic characteristics due to similar environmental pressures.
D. a process by which the better fit variants in a population become over-represented over time.
Answer: D
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Trisomy 21
a. only occurs to infants of women who get pregnant at 45 years or older. b. is caused by nondisjunction. c. is caused by having three X chromosomes. d. is usually lethal. e. occurs only among non-human primates.
In 2015 in the People’s Republic of China, approximately how many individuals migrated from rural to urban environments?
a. 300 million b. 117 million c. 82 million d. 7 million
In China, a market of kidnapped girls has developed in order to stabilize the gender skewing caused by the one-child policy
Indicate whether the statement is true or false
In contrast to linguistic anthropology, the primary focus of theoretical linguistics is on form and structure, with little or no attention to the social contexts in which language is used
Indicate whether the statement is true or false