MEIOSIS IN TRIPLOID ALL-FEMALE FISH (POECILIOPSIS, POECILIIDAE)
MEIOSIS IN TRIPLOID ALL-FEMALE FISH (POECILIOPSIS, POECILIIDAE)
复制标题
DOI：
10.1126/science.175.4029.1484
复制
发表时间：
1972-01-01
期刊：
影响因子：
56.9
通讯作者：
CIMINO, MC
中科院分区：
文献类型：
--
作者：
CIMINO, MC
在雌核发育全雌性形式的拟花木兰的三倍体减数分裂之前，三倍体卵原细胞核的染色体数目通过内有丝分裂提高到六倍体。不发生蒸发;相反，通过两次常规的减数分裂产生具有与母体相同的遗传互补的三倍体卵子。来自同域生殖（两性）物种的精子刺激卵子发育，但父本基因不整合到受精卵中。这是第一例经细胞学证实的鱼类产卵过程中的自然内有丝分裂。
Prior to meiosis in triploid gynogenetic all-female forms ofPoeciliopsis, 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.