In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b
is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald?
A) 0%
B) 25%
C) 33%
D) 50%
E) 75%
Answer: E
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The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the
a. sugar molecules. b. bases. c. phosphate molecules. d. hydrogen bonds. e. sulfide bonds.
Which of the following would be most effective and practical for routine home disinfection of a kitchen sponge between uses?
A. 70% Isopropyl alcohol B. Hydrogen peroxide C. Iodophor D. Chlorine bleach
When a 1-month-old baby is shown a piece of white paper with two dark, eye-sized spots, the baby will
A) smile. B) vomit. C) exhibit avoidance actions. D) not respond to a stimulus of this nature. E) exhibit fright.
A botanist identifies a new species of plant that has 32 chromosomes. It grows in the same habitat with three similar species: species A (2n = 14), species B (2n = 16), and species C (2n = 18). Which of the following is a possible mechanism by which the new species could have arisen from the others?
a. Either autopolyploidy due to a nondisjunction in the formation of gametes of species B or allopolyploidy associated with hybridization between species A and C b. Allopatric divergence by development of a mechanical reproductive isolating mechanism c. Autopolyploidy due to a nondisjunction in the formation of gametes of species B d. Allopolyploidy associated with hybridization between species A and C e. Change in a key developmental gene that causes the plants to flower at different times