The basic physical unit of heredity consisting of a DNA sequence at a specific location on a chromosome.
The molecule that forms the genetic code.
One of a number of long strands of DNA and associated proteins present in the nucleus of every cell.
One of a pair of chromosomes having corresponding loci.
The specific location of a gene on a chromosome.
An alternative form of a gene.
More than two possible alleles at a locus.
The combination of genes at a single locus or at a number of loci.
A one-locus genotype containing functionally identical genes.
A one-locus genotype containing functionally different genes.
The separation of paired genes during germ cell formation.
A sex cell.
The process of germ cell formation.
The independent segregation of genes at different loci.
The occurrence of two or more loci of interest on the same chromosome.
A reciprocal exchange of chromosome segments between homologs. Occurs during meiosis prior to the time homologous chromosomes are separated to form gametes.
The formation of a new combination of genes as a result of crossing over.
An organism in the early stages of development in the shell or uterus.
A cell formed from the union of male and female gametes.
The process that determines which egg matures and which sperm succeeds in fertilizing the egg.
A two-dimensional grid used to determine the possible zygotes obtainable from a mating.
The random sampling of parental genes caused by segregation and independent assortment of genes during germ cell formation and by random selection of gametes in the formation of the embryo.
An interaction between genes at a single locus such that in heterozygotes one allele has more effect that the other.
A form of dominance in which the expression of the heterozygotes is identical to the expression of the homozygous dominant.
A form of dominance in which the expression of the heterozygote is intermediate to the expressions of the homozygous geneotypes and more closely resembles the expression of the homozygous dominant genotype.
A form of dominance in which the expression of the heterozygote is exactly midway between the expressions of the homozygous genotypes.
A form of dominance in which the expression of the heterozygote is outside the range defined by the expression of the homozygous genotypes and most closely resembles the expression of the homozygous dominant genotype.
An interaction among genes at different loci such that the expression of genes at one locus depends on the alleles present at one or more other loci.
A phenotype for a simply-inherited trait is said to breed true if two parents with that phenotype produce offspring of that same phenotype exclusively.
The pattern of inheritance for genes located on sex chromosomes.
Having only one gene of a pair.
A pattern of inheritance in which phenotypic expression is limited to one sex.
A pattern of inheritance in which modes of a gene expression differ between males and females.