Both extremes of an array of phenotypes are favored in
A. directional selection.
B. disruptive selection.
C. stabilizing selection.
D. genetic drift.
E. gene flow.
Answer: B
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The accompanying figure shows a pedigree and the results of a Southern blot analysis of the ?-globin gene for four family members (II-1, II-2, II-4, and II-5). III-2 was just born and neither her health nor her DNA has been analyzed
The figure also shows a restriction map of ?A and ?S alleles and the location of three DNA probes (A, B, and C). If III-2 is analyzed by Southern blot using the same probe(s) as that used on other members of the family, what is the probability that the result will be only one band? A) 0 B) 1/9 C) 1/6 D) 1/4 E) 2/3
Refer to the accompanying figure. The structure labeled as 2 is homologous with the structure labeled as:
a. 1. b. 3. c. 4. d. 5. e. 7.
Which statement most accurately describes how we interpret the sensation of taste?
A. The taste buds contain microvilli that project into the taste pore. The molecules bind to receptor proteins located on the microvilli which send a nerve impulse to the spinal cord for interpretation. B. The taste buds contain microvilli that project into the taste pore. The molecules bind to receptor proteins located on the microvilli which send a nerve impulse to the brain for interpretation. C. The tongue moves molecules into the mouth so that the sinuses can detect the various scents. This information is then sent to the brain for interpretation. D. The taste buds contain receptor proteins that are located on the tongue. The molecules bind to receptor proteins which send a nerve impulse to the brain for interpretation. E. None of these describe how we interpret taste.
Hormones secreted by the posterior pituitary gland are made in the _____
A) cerebrum B) cerebellum C) thalamus D) hypothalamus