草鱼卵子和三角鲂精子杂交的受精细胞学研究

本实验观察了两种不同亚科鱼——草鱼()和三角鲂()杂交的受精细胞学过程,证实异源的三角鲂精子能够进入到草鱼卵子中,诱导星光并形成雄性原核。卵子在精子的作用下,继续完成了第二次减数分裂、排出第二极体,最后雌雄原核相互接触而融合。全部过程有正常的受精细胞学程序和卵裂方式,由此产生的后代兼具父、母本双方的遗传性状。

STUDIES OF INSEMINATION CYTOLOGY IN HYBRIDIZATION BETWEEN GRASS CARP AND PRESHWATER BREAM

This paper presents studies of inseination cytology on hybri-dization botween grass carp (Ctenopharyngodon idellus) and freshwater bream (Me-galobraman terninalis). The experiment reveals that the spermatozoon of the bream canether the egg cytoplasm of grass carp, then induces the emergence of the aster andfinally forms the male pronucleus. At the same time, the activated egg begins tocomplete the second polar-body. After the male and female pronulei come into being,they become contacted and fused. The author has ever studied the chromosomes of grass carp, the freshwaterbream and the F_1, hybrid. It has been found that the F_1 hybrid belongs to triploidalthough the parents are diploid. Hence it is gussed that the reason for producingtriploid is to emerge mitosis at the time of fertilization or to reserve seccnd polar-body.