Which statement about phenotype is false?
A. The phenotype is what the environment acts on
B. A behavior is a phenotype
C. Phenotypes are typically affected by a single genetic locus
D. The phenotype is what natural selection acts on
Answer: C. Phenotypes are typically affected by a single genetic locus
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This forms a seal that prevents the movement of substances between cells, for instance from the intestinal lumen into the blood.
A. gap junctions B. tight junctions C. desmosomes D. hemidesmosomes E. focal adhesions
Balanced polymorphism in a population is likely the result of
a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.
Guard cells
a. surround the stoma. b. control the opening to the interior of the leaf. c. become swollen when it becomes light, if environmental conditions are not too hot or dry. d. absorb water from surrounding epidermal cells. e. do all of these
Imagine you were the manager of a national park with cheetahs. The cheetahs feed primarily on gazelles, while the gazelles eat grass. It takes an acre of grassland to feed one gazelle, and it takes ten gazelles to feed one cheetah
You have a maximum of ten cheetahs when the system is functioning optimally. You would like to increase the cheetah population because people pay money to see the cheetahs. How much grassland do you need to double the cheetah population supported by this grassland? A) 500 acres B) 200 acres C) 100 acres D) 10 acres