One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that they will have a daughter with hemophilia? (Note: In this
problem, you must include the probability of having a daughter in your computation of the final probability.)
A) 1/16 B) 1/8 C) 1/4 D) 3/4 E) 1/2
Answer: C
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The sodium-potassium pump of neurons pumps
A. Na+ and K+into the cell. B. Na+ and K+ out of the cell. C. Na+ into the cell and K+ out of the cell. D. Na+ out of the cell and K+into the cell. E. Na+ and K+into the cell and H+ out of the cell through an antiport mechanism.
Although there are as many starlings in North America as there are in Europe, genetic variability in the
North American population is reduced relative to that in Europe because a. there are more environments in Europe. b. the North American population is derived from a small founder population. c. there is more gene flow in Europe. d. there is less mutation in North America. e. mutation is operating.
Long, slender extension used for locomotion by some bacteria, protozoans, and sperm.
What will be an ideal response?
In what types of organisms do plasmodesmata serve as a mechanism of cell-cell communication?
A. protists B. plants C. those types of organisms that spend only a portion of their life cycle in a multicellular state D. animals