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reciprocal cross
In genetics, a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern.〔(reciprocal cross definition )〕 All parent organisms must be true breeding to properly carry out such an experiment. In one cross, a male expressing the trait of interest will be crossed with a female not expressing the trait. In the other, a female expressing the trait of interest will be crossed with a male not expressing the trait.
For example, suppose a biologist wished to identify whether a hypothetical allele Z, a variant of some gene A, is on the male or female sex chromosome. He might first cross a Z-trait female with an A-trait male and observe the offspring. Next, he would cross an A-trait female with a Z-trait male and observe the offspring. Via principles of dominant and recessive alleles, he could then (perhaps after cross-breeding the offspring as well) make an inference as to which sex chromosome contains the gene Z, if either in fact did.
Such types of experiments are unlikely to actually be carried out in the contemporary era of DNA sequencing and molecular genetics.
==Reciprocal cross in practice==
Given that the trait of interest is either autosomal or sex-linked and follows by either complete dominance or incomplete dominance, a reciprocal cross following two generations will determine the mode of inheritance of the trait.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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