The presence or absence of sex chromatin in cells obtained by amniocentesis makes it possible to determine the sex of a fetus.

 
  • 通過(guò)檢查由羊膜腔穿刺術(shù)獲得的細胞中性染色體的有無(wú)可以確定胎兒的性別。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan