Genetics Exam 1 Flashcards
Allele
One of the different forms of a gene that can exist at a single locus
Wild Type
The genotype or phenotype that is found in nature or in the standard laboratory stock for a given organism
Dominant
The phenotype shown by a heterozygote
Recessive Allele
An allele whose phenotypic effect is not expressed in a heterozygote
Phenotype
The form taken by some character (or group of characters) in a specific individual. The detectable outward manifestations of a specific genotype
Penetrance
The proportion of individuals with a specific genotype that manifest that genotype at the phenotype level.
Genotype
The Allie composition of an individual or of a cell— either of the entire genome or, more commonly, of a certain gene or set of genes
Heterozygous Gene Pair
A gene pair having different alleles in the two chromosome sets of the diploid individual
Complementation
A test for determining whether two mutations are in different genes (they compliment) or the same gene (they do not complement)
Crossing over
The exchange of corresponding chromosome parts between homologous by breakage and reunion
Expressivity
The degree to which a particular genotype is expressed in the phenotype
F1 Generation
The first filial generation produced by crossing two parental lines
F2 generation
The second filial generation produced b y selfing or intercrossing the F1 generation
Genetic Map Unit (M.U.)
A distance on the chromosome map corresponding to 1 percent recombinant frequency
Linked
The situation in which two genes are on the same chromosome as deducted y recombinant frequencies less than 50%
