Explain how epigenetic inheritance (for example, DNA methylation) can result in different phenotypes observed in
identical twins (who have identical DNA sequences). What will be an ideal response?
Genetic inheritance refers to the inheritance of genetic sequences from the parents; any
sequence differences may affect protein structure and/or function. In contrast, epigenetic
inheritance refers to the inheritance of DNA modification patterns (for example, DNA
methylation) which affect gene expression. Identical twins with identical DNA sequences
may have different phenotypes due to gene expression, which may be the result of
differential DNA modifications.
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A ________ is a cancer of blood cells in which the cells proliferate in the bloodstream.
Fill in the blank(s) with the appropriate word(s).
When you arrive at your biology lab, you notice that your lab bench is set up with containers of clay, Mg2+, and nucleotides. What hypothesis do you think you will be testing during the lab, and what is the purpose of the Mg2+?
A. Formation of small organic molecules at deep sea vents; Mg2+ reacts with hot H2S. B. Formation of complex organic polymers on the surface of clay; Mg2+ catalyzes bond formation between nucleotides and clay. C. Formation of small organic molecules on the surface of clay; Mg2+ catalyzes bond formation between nucleotides and clay. D. Formation of small organic molecules in a reducing atmosphere; Mg2+ catalyzes redox reactions.
How does urban sprawl affect urban areas specifically?
A. consumption of agricultural land for development B. consumption of forested land for development C. increased dependence on foreign oil D. increased soil salinity in agricultural areas due to road salt pollution E. drain of tax dollars from the city
The most common mechanism for sympatric speciation in plants is
A. punctuated equilibrium. B. geographic isolation. C. disruptive selection. D. spontaneous mutation. E. polyploidy.