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生物个体上的不同部位存在着相对某一生物性状的生理和遗传差异及不同遗传区域,根据这一原理,选择人类所需要的期望性状或部位进行有性或
According to this principle, there are some physiological and genetic differences in a certain biological trait in different parts of a biological entity. According to this principle, the desired trait or part needed by human beings is selected for sexual or