Cimino M C
Science. 1972 Mar 31;175(4029):1484-6. doi: 10.1126/science.175.4029.1484.
Prior to meiosis in triploid gynogenetic all-female forms of Poeciliopsis, the chromosome number of the nucleus of the triploid oogonium is raised endomitotically to hexaploid. Recombination does not occur; instead, a triploid ovum with a genetic complement identical to that of the mother is produced by two conventional meiotic divisions. Sperm from a sympatric gonochoristic (bisexual) species stimulates the ovum to develop, but paternal genes are not incorporated into the zygote. This is the first cytologically verified case of natural endomitosis in the egg production in fish.
在三倍体雌核发育的全雌形式的食蚊鱼减数分裂之前，三倍体卵原细胞核的染色体数目通过核内有丝分裂增加到六倍体。不会发生重组；相反，通过两次常规减数分裂产生一个遗传互补与母亲相同的三倍体卵子。来自同域雌雄异体（两性）物种的精子刺激卵子发育，但父本基因不会整合到合子中。这是鱼类卵子发生过程中自然核内有丝分裂的首例经细胞学证实的案例。
