Selection that acts over evolutionary time to preserve traits that increase an individual's ability to mate is known as __________.
a. directional selection
b. disruptive selection
c. sexual selection
d. stabilizing selection
e. balancing selection
Answer: c. sexual selection
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When trying to make a mammalian protein in a bacterium, expression vectors are often used. Using your knowledge of prokaryotic and eukaryotic genetics, explain why expression vectors are so important
What will be an ideal response?
In a fetal pig, dorsal and ventral refer respectively to
(a) the head and tail regions of the body. (b) the tail and the head regions of the body. (c) the upper (back) portion and the lower (underside) portion of the body. (d) the lower (underside) portion and the upper (back) portion of the body.
Staphylococcus aureus is the causative agent of
A. bacterial vaginosis. B. puerperal fever. C. toxic shock syndrome. D. gas gangrene. E. bacterial vaginosis AND puerperal fever.
Which example is most clearly a case of density-dependent population regulation?
A) the summer drying of savanna grass for an insect that feeds on grass sap B) a dangerous new flu strain that is transmitted among humans by sneezing C) the first hard frost of fall for a population of annual morning glory vines D) the occurrence of rainstorms for an opportunistic desert annual