卵子发生

In about 30 per cent of cases, however, there is no family history of haemophilia, these cases arise as a result of new mutations occurring in the cells that produce eggs or sperms in the parents.

在大约30 ％的情况下，不过，有没有家族病史，血友病，这些个案出现，由于新的基因突变发生在细胞产生卵子或精子在家长。

Transcripts of zebrafish Hspa5 are present in fertilized eggs, suggesting their maternal origin. Zygotic expression of Hspa5 starts during midgastrulation and occurs in the hypoblast cells. It is specifically expressed in the hatching gland and the notochord during segmentation.

结果表明，Hspa5 mRNA在卵子中就存在，是一个母源基因；其合子基因的表达开始于原肠中期的下胚层，在体节期发生在脊索和孵化腺中。

The results show that, with the maturity of the gonad, the undifferentiated germ cell divided and differentiated to smaller oogonium or spermatogonia, and the oogonium or spermatogonia transformed to oocyte and sperm undergoing a series of maturation process.

摘 要 通过观察栉江珧的未分化生殖细胞，精原细胞和卵原细胞，精母细胞和卵母细胞，精子和卵子的形态结构与分布状况及核仁在卵成熟过程中的变化，对栉江珧生殖细胞发生及成熟过程的有关问题进行了探讨。

Female parthenogenesis in which the embryo contains only maternal chromosomes due to the failure of the sperm to fuse with the egg nucleus.

由于在精子与卵子融合过程中发生失败而使胚胎只包含母染色体的一种单性生殖。

This suggests that CaHIRA plays a role in the early embryo development and the late stages. The different expression characters of hira gene in these fish species may be related to the different reproduction models. The research on Drosophila has indicated hira gene related to sperm nucleus decondensation during fertilization. The high expression of hira gene before fertilization is prepared for the sperm nucleus decondensation and the formation of male prenucleus because colored crucian carp is bisexual reproduction. However, the sperm nucleus is not decondensated during the fertilization and is only to activate egg nucleus in gynogenetic gibel carp.

在彩鲫中，从未受精卵到胚胎发育的各个时期均可检测到表达，但表达量发生明显变化，受精后表达量迅速下降，直到原肠胚期表达量有所上升，并一直保持到出苗。hira基因在两亲缘种成熟卵子受精前后表达情况不同，可能与两种鱼不同的生殖方式有关。

The results are as follows:(1)in testis tissue, the expression of RB gene only was found in spermatocytes and prespermatids of seminiferous tubule of immature mice and spermatids of mature mice, and it was not found in the spermatogonia, spermatognial stem cell and primary metamorphous sperm from both immature and mature mice.

这些结果表明，RB基因在小鼠精子和卵子的发生过程中有着重要作用

This happens as the endometrium would only be needed if an egg was fertilised.?

子宫内膜只有在卵子受精后才会需要，因此这个才会发生。

After being treated with DTT, the germinal vesicle migrates and breaks down and the chromosomes are rearranged to the metaphase plate, followed by extrusion of the first and second polar body.

经DTT诱导后，生发泡发生移动并破裂，染色体排列到赤道板上，然后第一、二极体先后排出，诱导成熟的卵母细胞排出极体的时间与自然受精的卵子一致。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。