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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology