In Mendel's experiments on seed color in pea plants, when a dominant yellow seed-bearing plant was crossed with a recessive green seed-bearing plant, what was the approximate phenotypic ratio among the F2 generation?
A. 1 yellow: 3 green
B. 1 yellow: 1 green
C. 3 yellow: 1 green
D. all yellow
E. 9:3:3:1
C. 3 yellow: 1 green
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The purpose of sodium dodecyl sulfate (SDS) in a two-dimensional gel electrophoresis experiment is that it allows proteins to separated by
A. by charge only B. primarily by molecular mass C. by a combination of both size and mass D. net charge
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
A long-term study on guppies illustrates the effect of predation on life history traits. In this study, what occurred when guppies from streams with cichlids (prey on larger guppies) were moved to streams with killifish (prey on smaller guppies)?
a. Guppies became larger in one generation. b. Guppies became smaller in one generation. c. Guppies became larger over several generations. d. Guppies became smaller over several generations. e. Guppies did not change size.
What is the primary function of the endocrine system?
a. conduction b. contraction c. hormonal control of the body d. protection against disease e. cell production