When a single-gene mutation can have phenotypic effects at multiple stages of development, it is
A. pleiotropic.
B. incompletely dominant.
C. recessive.
D. causing a disease.
E. codominant.
A. pleiotropic.
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You explain to your study group that a hypothesis is:
A. constant over time. B. a proposition that will be true and fits the known facts. C. an explanation that accounts for careful observations D. a theory.
Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?
a. 1% b. 4% c. 10% d. 50% e. 75%
From the point of view of an angiosperm, what is the function of fruit?
A) It is where the male gametophyte develops. B) It is a mechanism for the dispersal of seeds. C) It provides nutrients to germinating seeds. D) It attracts pollinators.
All of the following conditions are necessary for an instrumental variable Z to be a valid instrument for X in the regression: Yi = ?0 + ?1Xi + Ui except for which condition?
A. Cov(Xi, Zi) ? 0 B. Cov(Xi, Yi) ? 0 C. Cov(Zi, Ui) = 0 D. None of these choices are correct.