An incompletely dominant gene controls the color of
chickens so that BB produces black, Bb produces a
slate-gray color called blue, and bb produces
splashed white. A second gene controls comb shape,
with the dominant gene R producing a rose comb and
r producing a single comb. If a pure-breeding, black
chicken with a rose comb is mated to a splashedwhite
chicken with a single comb in the F2
generation, what fraction of the offspring will be
blue with single comb?
a. 9/16
b. 3/8
c. 3/16
d. 1/8
e. 1/16
Answer: d
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Embryonic cell cycles allow the rapid division of cells in the early embryo. These mitotic cell cycles are much shorter in length than the mitotic cell cycles of cells in a mature organism. In the embryonic cell cycles, mitosis takes approximately the same amount of time as it does in the cell cycles of mature cells. What do you think is a result of the embryonic cycle?
A. Resulting daughter cells are smaller than the mother cell in the embryonic cell cycles. B. Resulting daughter cells do not contain the same genetic information as the mother cell in the embryonic cell cycles. C. Resulting daughter cells cannot form a mitotic spindle in the embryonic cell cycle. D. Mother cells in the embryonic cell cycle spend the majority of their time in G0. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about the cell cycle? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The infective larvae of the parasite S. stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs. The organism enters the bronchial tree and is then swallowed, entering the digestive tract, where the organism matures into an adult worm. This parasite is classified as which type of infection?
a. Pinworm b. Threadworm c. Whipworm d. Hookworm
When a tissue has become sensitized from a maladaptive immune response toward a normally harmless substance, this is termed what?
a. infection b. immunocompromised c. hypersensitivity d. immunodeficiency
Which of the following is not characteristic of primates?
a. stereoscopic vision b. grasping hands c. large brain size d. freely rotating limbs e. claws at the tips of digits