Which of the following statements is true about trisomy?
A. it is a result of nondisjunction
B. it is characterized by the presence of three chromosomes instead of a pair
C. Down syndrome is an example of trisomy
D. all of these
D. all of these
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Wallace's ideas differ from Darwin's in that Wallace __________
a. rejected artificial selection as analogous to natural selection b. insisted on the fixity of species c. supported Lamarckian ideas d. rejected evolution
Gametes are:
a. diploid. b. haploid. c. produced during mitosis. d. somatic.
__________ percent of all employed archaeologists in the U.S. have jobs directly related to the CRM
a. 25 b. 50 c. 40 d. 60
Groups who cooperate and have mutual obligations based on their descent from a shared ancestor who lived three or four generations ago are called
a. extended families. b. lineages. c. clans. d. chiefdoms.