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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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?  

Biology & Microbiology

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

Biology & Microbiology