Suppose that in plants, smooth seeds (S) is dominant to wrinkled seeds (s), and tall plants (T) is dominant to short plants (t). An F1 plant from a mating between homozygous plants that were tall/smooth and short/wrinkled was crossed to the short/wrinkled parent. What proportion of the progeny is homozygous for short and wrinkled alleles?
A) 1/2
B) 1/4
C) 1/8
D) 1/16
E) 0
B) 1/4
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Statistical analysis determines the _______ between observed data and what was expected from the original hypothesis
A. testcross B. degrees of freedom C. P values D. complete hypothesis E. goodness of fit
The most severe mass extinction on Earth occurred at the end of the ____ period
a. Cambrian b. Carboniferous c. Jurassic d. Permian e. Devonian
The principal driving force for guttation is
a. passive transport. b. sunlight. c. root pressure. d. upward pressure as sugar is forced into the roots. e. pumping by the xylem cells.
A hypothesis
1.is a tentative explanation for an observation that can be tested by further investigation. 2.is never tested by an experiment. 3.is never used by field biologists. 4.is the same as a theory.