Zimmering S, Bendbow E B
Genetics. 1973 Apr;73(4):631-8. doi: 10.1093/genetics/73.4.631.
Crossing over in the interstitial region of the heterozygous V(4) translocation in Drosophila melanogaster generates asymmetric dyads each consisting of a shorter and a longer chromatid. It was shown previously that in the female the shorter is recovered preferentially (Zimmering 1955); the present work suggests that the same occurs in the male as well. The mechanism in the female is envisioned as involving the non-random inclusion of the shorter chromatid into the functional egg (Novitski 1951); in the male, the two formal possibilities appear to be (1) that some proportion of sperm carrying the longer chromatid derived from an asymmetric dyad undergoes dysfunction, or (2) the longer chromatid is preferentially included into regularly-produced nonfunctional sperm, the nonfunctionality set up at the second division and distinguishing second division daughter cells.
在黑腹果蝇中，杂合V(4)易位的间质区域发生交换会产生不对称二价体，每个不对称二价体由一条较短染色单体和一条较长染色单体组成。先前已表明，在雌性中，较短的染色单体优先被回收（齐默林，1955年）；目前的研究表明，雄性中也会发生同样的情况。雌性中的机制被设想为涉及较短染色单体非随机地纳入功能性卵子（诺维茨基，1951年）；在雄性中，两种形式上的可能性似乎是：（1）携带源自不对称二价体的较长染色单体的一部分精子发生功能障碍，或者（2）较长的染色单体优先被纳入正常产生的无功能精子中，这种无功能状态在第二次分裂时建立，并区分第二次分裂的子细胞。
