Backcross A cross between an individual and an individual of the original parent generation.回交：杂交产生的子一代个体再与其亲本进行交配的方式。
Where the ranges of two species overlap, and fertile hybrids can be produced, these hybrids will tend to backcross with 两个物种的重合个体或是那些可育杂种将趋向于与优势种进行回交，因此，经过很多代之后，所得个体会与优势种的亲代相似。