Hutter P
Laboratoire de Génétique, Université de Genève, Switzerland.
Genet Res. 1990 Jun;55(3):159-64. doi: 10.1017/s0016672300025477.
This study reports on exceptional males which are obtained by using Drosophila melanogaster mothers carrying the balancers In(1)FM6 or In(1)FM7 as one of their X chromosomes. The phenomenon was first observed in interspecific crosses between D. melanogaster females and males of its closest relatives which normally produce unisexual female hybrid progeny. Whereas hybrid sons from these crosses die as third instar larvae, the presence of the particular X balancers in the mother allows a low percentage of sons to survive. Similar sterile males are also observed among non-hybrid flies. Data are presented which suggest that the males thus generated could be hyperploid for part of their X chromosome as a result of a meiotic event in their mothers or else they could start life as female zygotes and change sex through a mitotic event at an early stage.
本研究报告了通过使用携带平衡染色体In(1)FM6或In(1)FM7作为其X染色体之一的黑腹果蝇母亲获得的特殊雄性果蝇。这种现象最初是在黑腹果蝇雌性与其近亲雄性之间的种间杂交中观察到的，这些杂交通常产生单性雌性杂交后代。虽然这些杂交产生的杂交雄性后代在三龄幼虫期死亡，但母亲体内特定X染色体平衡器的存在使一小部分雄性后代得以存活。在非杂交果蝇中也观察到了类似的不育雄性。所提供的数据表明，由此产生的雄性果蝇可能因其母亲减数分裂事件而使其部分X染色体超倍体化，或者它们可能以雌性合子开始生命，并在早期通过有丝分裂事件改变性别。
