Rita Covas and colleagues found evidence of
stabilizing selection in African sociable weaver
birds. Their field studies indicate that
a. fat birds escape predators better than lean birds.
b. fat birds are less attractive to predators.
c. lean birds are more likely to starve.
d. good nesting sites are abundant.
e. each bird constructs its own nest.
Answer: c
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How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?
A. Horizontal gene transfer makes it impossible to distinguish monophyletic groups. B. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs, not all of the genes in a species were inherited from the common ancestor. C. Since horizontal gene transfer includes transfer from one group of species to another group with a common ancestor, there is no muddling of the concept of monophyletics. D. All of these are correct.
In small isolated populations, gene frequencies can fluctuate considerably. The term that applies to this circumstance is ________
A) stabilizing selection B) natural selection C) allelic separation D) genetic drift E) genetic isolation
How does sap move from the sieve tube into a sink?
A. by a pump B. by pressure C. by gravity D. by osmosis E. by active transport
Which of the following do NOT bind to the promoter sequence during regulation?
A) activators B) inducers C) repressors D) activators, inducers, and repressors