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Genetics Chapter Four: Doing Classical Genetics


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Mendelian crosses
Experiments where individuals of known ancestry are mated
Offspring produced by Mendelian crosses
Parental generation
Consists of individuals from purebred stock
Purebred stock
Only expresses one version of the phenotype; every individual homozygous for one allele
Phenotypes of the parental generation and the genotypes of gametes produced from the parental generation
First filial generation (F1)
Offspring produced by the parental generation
Matings between F1's and parentals
Test cross
Cross between an organism whose genotype is in doubt and an organism that is homozygous recessive for all genes of interest (testor)
Monohybrid cross
The purebred parents differ in one phenotype, the F1 has a single phenotype, the F2 shows either a 1:2:1 or 3:1 ratio of phenotypes in both sexes
Sex-limited genes
Mostly autosomal genes that control secondary sexual characteristics; never expressed in one sex
Sex-influenced phenotypes
Genes are expressed in both sexes, but the phenotype is modified in a sex-specific manner

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