Water moves into a cell when the solution surrounding the cell is
A.) hypertonic
B.) hypotonic
C.) isotonic
D.) concentrated
Ans: B.) hypotonic
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A gene for sweat gland production is located on the X chromosome. A man who lacks sweat glands marries a woman who has normal sweat glands. Which of the following are possible phenotypes of their children?
A. All of the boys will lack sweat glands. B. The boys will be mosaic; they will have patches of skin with sweat glands and patches of skin lacking sweat glands. C. Half of the girls will have sweat glands and half of the girls will lack sweat glands. D. Half of the boys will have sweat glands and half of the boys will lack sweat glands. E. The girls will be mosaic; they will have patches of skin with sweat glands and patches of skin lacking sweat glands.
The theory that evolution occurred slowly and that changes accumulate over long time periods is
A. gradualism. B. punctuated equilibrium. C. convergent evolution. D. divergent evolution.
Figure 18.1
In comparing a fairly conserved gene in humans, mice, lizards, and tuna, what can you say about their DNA sequences for the gene based on the cladogram provided?
A. The mouse and lizard would have more similar DNA sequences than the mouse and human. B. The human and lizard would have more similar DNA sequences than the human and mouse. C. The mouse and human would share more DNA sequences than the mouse and tuna. D. The tuna and lizard would share more DNA sequences than the human and lizard. E. The tuna and lizard would share less DNA sequences than the human and mouse.
Which of the following are not events in which genetic drift plays a key role?
A. migration B. bottleneck effect C. founder event D. All of the answer options are correct.