The most immediate effect of sexual displays and contests in animals (such as bighorn sheep bashing their heads together) is:
A) differential mating success. B) mutations.
C) disruptive selection. D) stabilizing selection.
Answer: A
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Which connective tissue is best at withstanding compression due the elasticity of its matrix?
a. loose connective tissue b. bone tissue c. cartilage d. fibrous connective tissue e. none of these.
The type of reproductive isolation exhibited by 13-
year and 17-year cicadas is a. spatial. b. behavioral. c. mechanical. d. temporal. e. ecological.
Whether a geographic barrier can block gene flow
depends on an organism’s a. means of travel. b. means of gamete dispersalspeed of travel. c. inclination to disperse. d. range of travel. e. A and B are both correct.
The modular nature of the Eve gene's regulatory region means that ______
(a) there are seven regulatory elements and each element is sufficient for driving expression in a single stripe. (b) all the regulatory elements for each stripe use the same transcriptional activators. (c) the E. coli LacZ gene is normally only expressed in a single stripe—unlike Eve, which is expressed in seven stripes. (d) transcription regulators only bind to the stripe 2 regulatory DNA segment in stripe 2.