The type of speciation that results in the formation of separate species as a result of geographic isolation is called ________ speciation.
A. gradual
B. adaptive
C. sympatric
D. sexual
E. allopatric
Answer: E
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Interleukins are
A. produced by leukocytes. B. important in both innate and adaptive immunity. C. involved in directly killing tumor cells. D. protein molecules. E. produced by leukocytes AND protein molecules.
In poultry, the genes for rose comb (R) and pea comb
(P) produce walnut whenever they occur together (R__ P__); single-combed individuals have the homozygous condition for both genes (rr pp). (a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp) with a pure-breeding pea comb (rr PP). (b) Give the phenotypic results of a cross of Rr Pp x rr Pp. (c) Give the phenotypic results of a cross of RR Pp x rr Pp. (d) Give the phenotypic results of a cross of Rr pp x rr Pp. (e) Give the phenotypic results of a cross of Rr Pp x rr pp. What will be an ideal response?
Organisms that reproduce repeatedly are said to be
A. semelparous. B. iteroparous. C. r-selected D. cohorts. E. K-selected
Which of the following species was once considered so benign that microbiologists used it to trace movements of air currents in hospitals and over cities?
What will be an ideal response?