159 



34 



genetic variation - all the variation due to different alleles and genes in 

 an individual, population, or species; includes variation in alleles and 

 genes influencing qualitative traits (under single gene control) and 

 quantitative traits (under polygenic control).^ 



genotype - the set of alleles for one or more genes in an organism; the 

 entire set of genes carried by an individual.'^ 



hatchery stock - a group of interbreeding fish that are artificially 



propagated in a hatchery setting and for whom the breeding history 

 of ancestors may or may not be known. 



inbreeding - the mating of related individuals.^ 



natural stock - a group of interbreeding fish that reproduce without the 

 aid of humans and whose ancestors probably include hatchery 

 propagated fish (degree of hatchery fish contribution is known or 

 unknown). 



regulatory gene - a gene whose function is to control the transcription of 

 other genes. Regulatory genes themselves do not code for synthesis 

 of a specific protein. (See definition for structural gene.) 



structural gene - a gene that codes for formation of a specific protein. 



wild stock - fish that have maintained successful natural reproduction 

 and are known to have had little or no supplementation from 

 hatcheries in past generations.^ 



^Same or modified definition from Riggs (1990), citing working glossary, 

 prepared for the Northwest Power Planning Council by Fred Allendorf with 

 reference to glossaries appearing in the Council's Fish and Wildlife Program 

 and in Kapuscinski and Jacobson (1987). 



^ Same or modified definition from Kapuscinski and Jacobson (1987). 



