__________ shifts the range of variation in traits in one direction. Fill in the blank(s) with the appropriate word(s)
Directional selection
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Meselson and Stahl relied on equilibrium density gradient centrifugation in a ________ solution to resolve the DNA containing 14N from the DNA containing 15N.
A) radiolabeled phosphate B) calcium chloride C) radiolabeled nitrogen D) sodium acetate E) cesium chloride
If 2 spot (S) is dominant to 4 spot (s), give the
genotypes for the parents in the following crosses: (a) 2 spot x 2 spot yields 2 spot and 4 spot (b) 2 spot x 4 spot yields only 2 spot (c) 2 spot x 4 spot yields 2 spot and 4 spot (d) 2 spot x 2 spot yields only 2 spot (e) 4 spot x 4 spot yields only 4 spot What will be an ideal response?
T cells mature in the
A. bone marrow. B. thymus. C. Peyer's patches. D. nervous tissue.
The radius and ulna are considered to be part of
a. both the axial skeleton and the appendicular skeleton. b. the axial skeleton. c. neither the axial skeleton nor the appendicular skeleton. d. the appendicular skeleton. e. the adaxial skeleton