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Genotype - The set of alleles at one or more loci in a organism; the entire <br />set of genes carried by an individual. <br />Half-sibs - Individuals having one parent in common. <br />Haploid - a cell (i.e., gamete) or organism with a single set of homologous <br />chromosomes. <br />Hardy-Weinburg equilibrium - the relationship between allelic and genotypic <br />frequencies in a stable population after a single generation of random mating. <br />Heterozygote - A cell or organism with two different alleles at a particular <br />locus. <br />Homozygote - A cell or organism with two identical alleles at a particular <br />locus. <br />Hybridization - Interbreeding of different species and the union of gamete <br />that results in a new organism. <br />Inbreeding - Mating of closely related individuals (e.g., brothers and <br />sisters). <br />Inbreeding Depression - The loss in fitness of offspring due to the unmasking <br />of deleterious recessive alleles that results from mating closely related <br />individuals. <br />Isozymes - Multiple molecular forms of enzymes that promote the same chemical • <br />reaction but may be the products of alleles at different loci. <br />Locus - the position of a particular gene on a chromosome. <br />Mitochondrial DNA (mtDNA) - Deoxyribonucleic acid (DNA) found in the <br />mitochondria of a cell; mtDNA is inherited from the maternal parent. <br />Natural selection - The selection of successful genotypes in natural <br />environments on the basis of phenotypic traits related to fitness. <br />Naturalized stocks or populations - Fish that have become established in river <br />reaches after augmentation or restoration stocking and are completing their entire <br />life cycle in natural environments. <br />Outbreeding Depression - The loss in fitness of offspring due to the breakdown <br />of coadapted gene complexes from mating individuals that are too distantly related. <br />Phenotype - The physical characteristics of an individual organism that can be <br />detected visually; phenotypes are influenced by the genotype and environment. <br />Polymorphic - A gene or qualitative trait that exists in two or more forms in <br />a population. <br />Population - A group of organisms that freely interbreed. <br />34 0