In the absence of predators, what do you think was the main selection factor affecting the average number of spots on male guppies?
a. an infectious disease that influenced pigment deposition in guppy integument
b. sexual selection by females for males with high spot numbers
c. a completely random process
d. none of the above
b
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Transfer of genetic information via direct cell-cell contact is called
A. transduction. B. transformation. C. transfection. D. conjugation.
The autonomic subdivision consists specifically of:
a. central and peripheral nerves b. parasympathetic and sympathetic nerves c. somatic and involuntary nerves d. brain and spinal cord e. spinal and cranial nerves
The binomial nomenclature for humans is Homo sapiens. The term "Homo" refers to the
a. genus name. b. species name. c. scientific name. d. trivial name. e. ordinal name.
Pyramids of numbers are of limited usefulness because they:a
do not indicate the biomass of the organisms at a given time. b. do not indicate the gross primary productivity of each species. c. do not include energy flow through the ecosystem. d. include three trophic levels. e. have limited reliability of the actual numbers involved.