In experimental genetics, matings were given specific names depending on the genotypes of the mates.

Parents : P1(AA) x P2(aa)
F1 generation (FilialGeneration no.1) : 

if, the mating is
  F1 x F1  : ''Intercross''
  F1 x P1  or F1 x P2  : ''Backcross''

2개 이상의 locus를 이용하여 mating을 하여,
P : AABB x aabb
F1 : AaBb  일때,
  AaBb x AaBb  : ''DoubleBackcross''
  AaBb x AABB (or aabb)  : ''DoubleIntercross''