A dominant allele does not express itself in every person that contains it; occasionally parents without the characteristic have children that show the characteristic. This statement represents a feature known as
A. fitness.
B. expressivity.
C. recessiveness.
D. penetrance.
D. penetrance.
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Indifferent gonads are
A) the gonads of people who have no interest in having sex. B) paired structures in the embryo that can develop as either testes or ovaries. C) paired structures in the embryo that follow a male developmental program and a female pathway in the same person at the same time. D) the gonads that develop when a person uses birth control.
When reproductive interests between males and females of the same species differ, as in the case of fruit flies, sexual selection may actually favor adaptations arising in one sex but that are detrimental in the other sex
This, in turn, leads to subsequent "counter-measure" adaptations in the sex that are subject to harm or detriment. This kind of antagonistic sexual adaptation has been termed ________ sexual selection. Fill in the blank(s) with correct word
Morphological differences in European beaver and ____ contributed to Darwin's thoughts on reasons
for species differences.
a. South American nutria b. South American iguana c. extinct glyptodont d. nine banded armadillo e. South American beaver
The plasma membrane barrier to passive diffusion is primarily a function of the membrane's
a. phospholipids. b. cholesterol. c. proteins. d. glycoproteins.