A pair of chromosomes of the same length, centromere position, and staining pattern that possess genes for the same characters at corresponding loci. One homologous chromosome is inherited from the organism’s father, the other from the mother. Also called homologs, or a homologous pair.
A discrete unit of hereditary information consisting of a specific nucleotide sequence in DNA
Any detectable variant in a genetic character.
Any of the alternative versions of a gene that produce distinguishable phenotypic effects.
An allele that is fully expressed in the phenotype of a heterozygote
An allele whose phenotypic effect is not observed in a heterozygote.