Carson H L
Proc Natl Acad Sci U S A. 1973 Jun;70(6):1772-4. doi: 10.1073/pnas.70.6.1772.
Five parthenogenetic laboratory strains of Drosophila mercatorum have been examined for their mode of diploidization in the eggs of females. Diploidization occurs either by pronuclear duplication leading to complete homozygosity or by nuclear fusion. If the latter occurs between pronuclei from different secondary oocytes, heterozygosity can be maintained. Each of the five strains shows some nuclear fusion and three show significantly different amounts, ranging from about 21% to less than 1%. Even in strains with a strong tendency towards homozygosity, it is argued that this dual system of nuclear reconstitution provides for genetic recombination; thus, the strains retain considerable evolutionary potential.
对五株实验室孤雌生殖的墨卡托果蝇品系进行了研究，以观察其在雌蝇卵中的二倍体化模式。二倍体化通过原核复制导致完全纯合，或者通过核融合发生。如果核融合发生在来自不同次级卵母细胞的原核之间，则杂合性可以维持。这五个品系中的每一个都表现出一定程度的核融合，其中三个品系的核融合量差异显著，范围从约21%到不到1%。即使在具有强烈纯合倾向的品系中，也有人认为这种核重组的双重系统为基因重组提供了条件；因此，这些品系保留了相当大的进化潜力。
