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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