Patterns of inheritance

phenotype

expression of genes

genotype

genetic constitution of an organism (the alleles it has for a gene)

homozygous

pair of homologous chromosomes carrying the same alleles for a single gene

heterozygous

pair of homologous chromosomes carrying two different alleles for a single gene

codominant

both alleles are expressed in the heterozygote resulting in different phenotype

sex linkage

a genes whose locus is on the x chromosome

autosomal linkage

genes that are located on the same chromosome (not the sex chromosomes)

epistasis

when one gene modifies or masks the expression of a different gene at a different locus

monohybrid

genetic inheritance cross of a characteristic determined by a singular gene

dihybrid

genetic inheritance cross of a characteristic determined by two genes