The prevalence of the allele for sickle cell anemia in some populations is an example of?
A. Heterogeneous environments
B. Balancing selection
C. Inverted selection
D. Non-Darwinian selection
E. Nonrandom mating
B
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A modification that occurs to a nuclear gene that alters gene expression without modifying the DNA sequence is called _______ inheritance
A. extranuclear B. cytoplasmic C. maternal effect D. epigenetic E. nuclear
When retreating glaciers carved deep coastal valleys they created:
a. fjords. b. salt-wedge estuaries. c. well-mixed estuaries. d. tectonic estuaries. e. drowned river valleys.
Researchers use HeLa cells to
a. study cancer. b. study viral growth. c. perform protein synthesis. d. study the effects of radiation. e. do all of these.
What sequence of events usually occurs in the process of protein synthesis?
A) Protein ? RNA ? DNA B) RNA ? DNA ? protein C) DNA ? RNA ? protein D) RNA ? protein ? DNA