A mutation of a segmentation gene can result in all of the following EXCEPT
A. missing body regions.
B. incorrect establishment of body axes.
C. altered expression of homeotic genes.
D. replacement of one body part with another.
E. duplication of body parts.
Answer: B
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The absorptive epithelia in the gut are considered "polarized" because _____
A) thick and thin filaments are present B) they pump wastes into the lumen while pumping nutrients toward the blood C) the colors seen on the top and bottom of the cells are different D) they must fire action potentials to absorb most nutrients E) the apical surface is different from the basal surface
You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)
A. 36% B. 43% C. 48% D. 57% E. 84% 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 already know about the Hardy-Weinberg principle? 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?
Allergens combine with IgE to cause mast cells to release ________
A) interferons B) histamine C) plasma cells D) interleukin I
What is the "true body cavity" called?
a. Endoderm b. Mesoderm c. Coelom d. Triploblastic