Small groups of individuals leave their home population and establish new settlements, mating only among themselves, are referred to as the
A. founder effect.
B. bottleneck effect.
C. artificial effect.
D. natural effect.
E. migration effect.
A. founder effect.
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The toxicity of a given drug is expressed as the
A. selective toxicity. B. biocide index. C. biostatic index. D. therapeutic index
Mammals underwent an evolutionary "explosion", or major adaptive radiation, during the ____
a. Mesozoic era b. Cambrian period c. Triassic period d. Devonian period e. Cenozoic era
If a pure-breeding long-tail cat (LL) is crossed with a
pure-breeding cat with no tail (rumpy, ll), and a cat with a short tail (stumpy) is produced, the simplest explanation is a. a mutation. b. an X-linked gene. c. an incompletely dominant gene. d. a lethal gene. e. chromosomal aberration.
A somatic cell from a corn plant normally contains 20 chromosomes. How many sister chromatids would that cell contain during G2 of the cell cycle?
A. 20 B. 10 C. 40 D. 0