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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Cumulative density function. Probability that a variable takes on a value less than a given number; for example, the probability that an individual dies before passing age x D Dominance. Determination of the phenotype of a heterozygote by one allele. Dominant alleles suppress the effects of recessive alleles when the latter are also present in diploid organisms DNA. Deoxyribonucleic acid; the molecular basis of heredity E Ecdysone. The hormone produced in insects that induces molting and metamorphosis Electrophoresis. A technique used to separate mixtures of ionic solutes by differences in their rates of migration in an applied electric field Ethological. Behavioral Ethology. The scientific study of animal behavior, particularly under natural conditions Eukaryote. Organism whose cells have a true nucleus (one bound by a nuclear membrane) within which are the chromosomes Eusociality. Social system in which certain individuals enhance their fitness by aiding their collateral kin to rear their offspring. For example, sterile female worker bees may rear the offspring of their fertile sister queens F F2. Second filial generation; all of the offspring produced by the mating of two individuals of the first filial generation Fecundity. Ability to produce offspring rapidly and in large numbers. In demography of human populations, the physiological ability to reproduce, as opposed to fertility Fertility. Reproductive potential. In demography, the number of births per year divided by the number of women of childbearing age, expressed as a rate Fibroblast. Connective tissue cell that can differentiate into other blastic cells to form fibrous tissues; a fiber-producing cell widely distributed in tissues Fitness. The ability of a genotype to reproduce its alleles in a particular environment or after some environmental change Free radical. A highly reactive chemical moiety characterized by unpaired electrons, which can damage the cell fabric and other biological macromolecules. G Gamete. Egg or sperm cell; germ cell Gene. A unit of inheritance coded by DNA, carried on a chromosome, transmitted from generation to generation by the gametes, and controlling the development and characteristics of an individual
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