a cross between the progeny of a cross and one of the parents.
A genetic cross between an offspring and one of its parents or an organism genetically identical to one of its parents.
A cross of a hybrid to either of its parents. In genetics, a cross of a heterozygote to a homozygous recessive. The cross of a hybrid to one of its parental types; a method of incorporating traits into otherwise adapted cultivars. May include multiple crosses to a recurring parental cycle.
A cross between an animal that is heterozygous for alleles obtained from two parental strains and a second animal from one of those parental strains. Also used to describe the breeding protocol of an outcross followed by a backcross. See also: model organisms