Describe a convenient method for determining gene order from three-point cross results
What will be an ideal response?
Compare the double-crossover class with the parental class and ask which gene has switched places. The gene that switched places is in the middle.
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Why is the most damage to the brains of Huntington disease patients observed in the striatum?
a. The Rhes protein, needed for mutant huntingtin to become toxic, is only produced in the striatum.
b. The huntingtin gene is only expressed in the striatum.
c. The mutant huntingtin protein becomes toxic when bound to the Rhes protein, which is abundant in the
striatum.
d. Only the cells of the striatum contain the huntingtin mutation.
e. The CAG expansions are corrected in regions of the brain other than the striatum
A nerve may be as long as
a. one inch. b. 12 inches. c. a few millimeters. d. 3 or 4 feet. e. one foot.
One way in which ions are specifically transported into the cell is via
A) gated channels. B) simple diffusion. C) carrier (permease) proteins. D) uniport transporters. E) ABC transporters.
Tropical rain forests typically have a thick layer of litter on the forest floor
Indicate whether the statement is true or false