If the small groups of Viking explorers in Greenland and North America had survived and given rise to new populations, such a scenario would be an example of
A. genetic drift among the original Viking explorers.
B. gene flow from continent to continent.
C. the founder effect.
D. the bottleneck effect.
E. directional selection.
Answer: C
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The infection cycle of HIV includes all of the following steps except
A. attachment. B. entry. C. replication. D. immediately killing the host cell. E. viral DNA integrates into the host chromosome.
During inhalation
a. the pressure in the thoracic cavity is greater than the pressure within the lungs. b. the pressure in the alveoli is less than the atmospheric pressure. c. the diaphragm moves upward and becomes more concave. d. the chest cavity volume decreases. e. all of these occur.
Leaves that live for only a single year or growing season are classified as ________
Fill in the blank(s) with correct word
A homologous pair of mitotic chromosomes will possess ________ alleles for each locus.
A. one B. 50% of the C. eight D. four E. two