How does the sexual life cycle increase the genetic variation in a species?
A) by allowing independent assortment of chromosomes
B) by allowing random fertilization
C) by allowing crossing over
D) A and B only
E) A, B, and C
Ans: E) A, B, and C
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A photoreceptor in seeds detects the ratio of red to far-red light, preventing seeds from germinating when:
A. it is too warm. B. it is too cold. C. they are in the shade of another plant. D. they are in direct sunlight. E. it is too dry.
Viruses that infect bacteria are specifically called ________.
A. prions B. satellite viruses C. viroids D. bacteriophages
Which is a component of the fossil record?
A. bones of dinosaurs B. the distribution of murid rodents in Australia and Asia C. information about geological formations
Suppose the regression line to describe the relationship between Y and a dichotomous treatment (X = 1 for treated, = 0 untreated) is given by Y = 4 + 3X. Suppose that one of the observations that was treated was observed to have an outcome, Y = 8. For this observation, what is the residual?
A. 7 B. 0 C. 1 D. -1