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人的第9号染色体涉及亚着丝点异染色质(Subcentromeric heterochromatin)的变型,有人主张与精子数目的降低和低育性(Subfertility)有关。这些变型也发现随夫妇中经常的自发性流产的频率而增加。这些资料表明,这些变型可能是通过改变减数分裂和/或有丝分裂而使男性和女性的配子
Human chromosome 9 involves a variant of subcentromeric heterochromatin, with some arguing for a decrease in the number of sperm and the associated subfertility. These variations are also found to increase with the frequency of frequent spontaneous abortions in couples. These data suggest that these variants may be male and female gametes that may be altered by changing meiosis and / or mitosis