Many male songbirds are brightly colored.  However, the color of the birds is determined by a balance of

A. natural selection against bright colors by predation and sexual selection in favor of bright colors.
B. mutations that reduce bright colors and sexual selection in favor of bright colors.
C. gene flow that reduces bright colors and natural selection in favor of bright colors.
D. mutations that reduce bright colors and gene flow in favor of bright colors.
E. natural selection against bright colors by predation and mutations that introduce bright colors.


Answer: A

Biology & Microbiology

You might also like to view...

Acetylcholine receptors can be differentiated by their ability to be activated by substances such as ________ and ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The condition ____________________ can occur when an Rh- woman becomes pregnant by an Rh+ man. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group.  This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated.  AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate.  ATP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate.  There are other regulators of this enzyme as well.  What is the role of AMP in this example?

A. Catalyst B. Noncompetitive inhibitor C. Allosteric inhibitor D. Competitive inhibitor E. Allosteric activator

Biology & Microbiology

Blastomycosis results from

A) inhalation of spherules. B) inhalation of respiratory droplets. C) inhalation of fungal spores. D) contact with fomites. E) contact with infected sputum.

Biology & Microbiology