短語詞組短語strands double crossing over 釋義雙線雙交換degressive double crossing over 消減性雙交換strand double crossing over 三線雙交換progressive double crossing over 漸進(jìn)雙交換double crossing over tetrad 雙交換四分染色躰;雙交換四分躰double crossing -over 雙交換four strands double crossing over 四線雙交換four strand double crossing over [遺]四線雙交換two strands double crossing over 兩線雙交換 返回 double crossing over