Most biologic arrangements seem so obvious, and so well adaptedto their uses, that we tend to forget that things might havebeen worked out quite differently. Impious as it may be, itis worth thinking about evolutionary alternatives -- if onlyto deepen appreciation and understanding of the way things are.
Take, for example, the arrangements needed to guarantee survivalthrough sexual reproduction. In brief, three types of differentiationhave to be achieved.1 Gonadal differentiation is required togenerate complementary haploid gametes capable of fertilization.Genital differentiation is required to bring the gametes togetherand to provide a warm, . . . [Full Text of this Article]
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A correction has been published: N Engl J Med 1995;332(4):279.
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