Imagine that a mutation for red eye color becomes very common in a population of flies because female flies in this population prefer to mate with red-eyed males. This is an example of
A) directional selection.
B) stabilizing selection.
C) disruptive selection.
D) sexual selection.
E) genetic drift.
D
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Failure to reach equilibrium with a disease agent could result in extinction for a host species
Indicate whether the statement is true or false.
What is a disadvantage of asexual reproduction? a. It does not introduce variety into populations
b. Finding a mate is not required. c. It is not an efficient process. d. It can create high density of populations.
Herring gulls feed their chicks by regurgitating food for the chick in the nest. When a chick pecks at the red spot on the gull's beak, the parent regurgitates the food. Interestingly, the chicks will peck at any red spot, whether it is attached to a gull or not. Which features of this behavior are correctly labeled? (Check three.)
_____ Fixed action pattern -- finding a healthy variety of food for the chick _____ Fixed action pattern -- pecking at the spot _____ Innate releasing mechanism -- neural circuit that induces pecking in response to a red spot _____ Innate releasing mechanism -- the red spot _____ Key stimulus -- the shape of the parent's beak _____ Key stimulus -- the regurgitated food _____ Key stimulus -- the red spot Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about feeding behaviors? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as _____
A) a noncompetitive inhibitor of the enzyme B) an allosteric activator of the enzyme C) a cofactor necessary for enzyme activity D) a coenzyme derived from a vitamin