Kristen and Peter just had a baby boy. If he has no genetic abnormality, the newborn baby's twenty-third set of chromosomes must contain
a. two X chromosomes and one Y chromosome.
b. one X chromosome and two Y chromosomes.
c. one X chromosome and a very large Y chromosome.
d. one X chromosome and a smaller Y chromosome.
D
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Why might it actually be less painful to sleep on a bed of nails than to be stabbed in the finger with one (at least in theory)?
A) The mechanoreceptors are only sensitive to light touch. B) There are more free nerve endings in our fingers than our backs. C) There are more mechanoreceptors devoted to the back than the fingers. D) There are fewer free nerve endings in our fingers than our backs.
Jackie is always buying several packs of baseball cards, but only a fraction of those packs actually add new cards to her collection. She is likely on a __________
a) fixed-ratio. b) variable-ratio. c) fixed-interval. d) variable-interval.