Referring to a plant sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?
A) sporophyte meiosis
B) gametophyte mitosis
C) gametophyte meiosis
D) sporophyte mitosis
E) alternation of generations
Ans: B) gametophyte mitosis
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A number of species have declined in abundance around Boston, Massachusetts, since Thoreau's time. These tend to be:
A. the plants least able to change their flowering time. B. the plants that have changed their flowering time the most. C. the plants that have the earliest flowering time. D. the plants that have the latest flowering time. E. None of the above.
The chi-square value is the sum for all progeny classes of (observed-expected)2/expected. Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked. What is the chi-square value?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 0
B) 0.0576
C) 10.8
D) 14.4
E) cannot be determined
Which of the following organisms are major producers of oxygen by photosynthesis in the ocean?
A. Cyanobacteria B. Diatoms C. Dinoflagellates D. All of the above are important producers of oxygen.
The body's automatic tendency to maintain a constant and optimal internal environment is termed _____
A) balanced equilibrium B) physiological chance C) homeostasis D) static equilibrium