The formation of a Barr body
A)
causes the genes on one of the X chromosomes in a female cell to be switched off.
B)
always causes the same X chromosome in a female’s cells to be switched off.
C)
switches on the Y chromosome in a male cell.
D)
none of the above

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regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.