Which hypothesis explains why most examples of sexual dimorphism result in males with more elaborate decorations than females?
a. Females cannot exhibit elaborate decorations because they must protect their eggs.
b. Males are always physically larger and stronger than the females of the same species.
c. Males experience greater variance in reproductive success than females in those species.
d. Decorations displayed by males originate in genes absent from X chromosomes.
c. Males experience greater variance in reproductive success than females in those species.
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As soils dry, root cells at the root tip produce _________, which ____________
A. abscisic acid; stimulates root elongation B. abscisic acid; suppresses root elongation C. ethylene; stimulates root elongation D. ethylene; suppresses root elongation E. auxin; stimulates root elongation
You discover a fungus that makes both sexual and asexual spores. The sexual spores are made in
groups of eight within a structure that bursts open to release the spores. The structures containing sexual spores are found within a multicellular structure that is about five inches tall. Into which group should you classify this fungus?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
What event will increase the frequency of a
mutation in a population over time?
a. fitness b. natural selection c. artificial selection d. adaptive radiation e. none of these
The secondary level of protein structure is represented by the sequence of amino acids.
a. true b. false