Which is a true statement concerning genetic variation?
A) It is created by the direct action of natural selection.
B) It arises in response to changes in the environment.
C) It must be present in a population before natural selection can act upon the population.
D) It tends to be reduced by the processes involved when diploid organisms produce gametes.
E) A population that has a higher average heterozygosity has less genetic variation than one with a larger
average heterozygosity.
Ans: C) It must be present in a population before natural selection can act upon the population.
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European explorers sailing across the Pacific leave several pairs of pigs on a remote island with the intention of visiting again in future years to harvest fresh meat. This would most resemble a case of artificially induced allopatric speciation through:
A. vicariance. B. dispersal.
Which of the following is true about the chemical bonds found in proteins and nucleic acids?
A. Covalent bonds result when an electron is completely transferred to another atom such that the atoms are drawn together by electrostatic charges. B. Ionic bonds result when two atoms share electrons equally. C. Atoms having a small difference between their electronegativities are more likely to form covalent bonds. D. Ionic bonds are most likely to form between two metal atoms. E. The strength of a covalent bond can vary with the salt concentration of the environment.
The protist that is most closely related to animals is the:
a. amoeba b. choanoflagellate c. dinoflagellate d. euglenoid e. paramecium
The greatest contributor(s) to allopatric isolation is
(are) a. geographic barriers. b. differences in reproductive timing. c. gametic incompatibility. d. hybrid inviability. e. behavioral peculiarities.