In normal cells, p53 protein acts as
A) a signal transducer.
B) a tumor suppressor.
C) a proto-oncogene activator.
D) a GTPase inhibitor.
E) None of these
E
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The observation that most pureblood Native Americans have type O blood is best explained by _____
A. gene flow. B. assortative mating. C. genetic drift. D. a founder effect. E. frequent mutations.
Which of the following is an example of stabilizing selection?
A. selection for average birth weight in humans B. antibiotic resistance in bacteria C. decrease in the number of birds with intermediate-sized beaks who are unable to eat large or small seeds D. breeding dogs from wolves
Which of the following ions does not contribute to information flow in a nervous system?
A. chloride B. calcium C. hydrogen D. potassium
Two genes on each of four homologous chromosomes (HC) are described here, but only one of each
pair of sister chromatids is listed (HC1 and HC2). Capital and lower case indicate different alleles of the same gene. What four gametes will result from a single chiasma if the chromosomes have the following genes: HC1: ab; HC2: AB?
a. Ab, AB, ab, aB b. Ab, Ab, aB, aB c. Aa, Bb, ab, Ab. d. Ab, Ab, AB, AB e. AB, AB, ab, ab