久久国产欧美日韩精品,日韩国产精品久久久久久亚洲,99视频精品全部免费免费,91精品国产综合久久走光

Crossing over The exchange of material between homologous chromatids by the formation of chiasmata.交換:同源染色單體之間形成交叉時遺傳物質的交換現象....

n.交叉( chiasma的名詞復數 )...

chiasmata的音標：...