Which antibody class protects the fetus?
a. IgG
b. IgA
c. IgE
d. IgD
e. IgM
ANSWER: a
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If a human has the genotype XXXY, they would have:
A. 3 inactivated X chromosomes and be male. B. 2 inactivated X chromosomes and be male. C. 3 inactivated X chromosomes and be female. D. 2 inactivated X chromosomes and be female. E. 1 inactivated X chromosome and be male.
Which early naturalist is known for describing nature as a continuum of organization?
a. Darwin b. Plato c. Mendel d. Galileo e. Aristotle
The development of organisms is based on
a. which genes are active in a given cell. b. when the genes function. c. what gene products appear. d. the amount of cellular products generated. e. all of these.
What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait (aa) has not changed over time?
A) The two phenotypes are about equally adaptive under laboratory conditions. B) The genotype AA is lethal. C) There has been a high rate of mutation of allele A to allele a. D) There has been sexual selection favoring allele a.