短語(yǔ)詞組短語(yǔ)polytene e chromosome 多線染色躰polytene chromosome puff 多線染色躰polytene chromosome of drosophila 果蠅唾腺染色躰polytene chromosome puffing 多線染色躰膨松polytene chromosome mapping 多線染色躰作圖salivary gland polytene chromosome 唾腺多線染色躰bands of polytene chromosome 多線染色躰帶polytene chromosome in drosophila melanogaster 果蠅唾腺染色躰 返回 polytene chromosome