胚胎的性别早在受精时就决定了。
他从胚胎的耳朵部分中，取出一个泡囊移植到腕部。
Who took a ball, the vesicle, and he transplanted from the embryo, the ear region, to a limb.
暂停胚胎的发育比与其兄弟姐妹竞争更有利于使它做好准备以避免艰难时期的到来。
The pause of the development of an embryo has more benefits for preparing it to avoid the harsh times than for competing with its siblings.
这使她能够在干旱和食物短缺时暂缓胚胎的发育，直到育儿袋里的后代能够独立生活。
This allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.
在其他好处中，这使她能够在干旱和食物短缺时期冻结胚胎的发育，直到育儿袋中的后代有能力自己离开。
Among other benefits, this allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.
因为现今的联邦法律已经禁止使用联邦基金克隆胚胎用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。
Because current federal law already forbids the use of federal funds to create embryos for research or to knowingly endanger an embryo 's life, NBAC will remain silent on embryo research.
有可能是在胚胎的神经系统开始形成的时候。
A likely moment occurs as the embryos' nervous systems begin to form.
发育8天后，老鼠早期胚胎的，外胚层开始增厚。
This surface layer thickens at an early stage in a mouse after 8 days of development.
在这八周了，这些染色体是男性胚胎和女性胚胎的唯一区别。
For a few weeks, these chromosomes are all that differentiates male embryos from female embryos.
他们用一种病毒来把这些基因引入老鼠胚胎的皮肤细胞，然后进行监测。
A virus was used to introduce the genes to mouse embryo skin cells, which were then monitored.
大部分患者会有一个认证号码，这个号码同样也是被存储的胚胎的号码。
Most patients get an identification number that also is kept with the embryos while they are stored.
无论是在美国还是在别的国家，人们都对胚胎的现状及其是否享有权利感到困惑。
In America, as elsewhere, people are confused about the status of embryos and whether they have any rights.
它们的保存质量非常的好，但更令人称奇的是保存下来的育有胚胎的鱼龙化石数目。
The quality of preservation is outstanding, but what is even more impressive is the number of ichthyosaur fossils containing preserved embryos.
有线索表明，在与细胞发育成各种组织相关的早期胚胎的功能中，逆转录酶是必需的。
There are hints that reverse transcriptase is needed for a lot of early embryonic functions associated with getting cells ready to specialise into different types of tissue.
大鼠通过消化，甲基通过自己的方式进入了胚胎的染色体，转变成具有决定性的基因。
After being consumed by the mothers, the methyl donors worked their way into the developing embryos' chromosomes and onto the critical agouti gene.
随着胚胎的发育，细胞这个石块也就从山顶上往下滚，随着地势分支进入不同的峡谷。
As the embryo develops, the cell rolls downhill into a series of branching valleys.
现在，一份对鸡胚胎的研究，鸟类的翅膀的趾中确实有类似于人类拇指、食指和中指的趾的分化。
Now, a study of chick embryos shows that birds do indeed have thumb, index, and middle "fingers" in their wings.
体细胞无性系变异发生在组织和胚胎的培养，即使没有基因改造，但基因改造往往使情况变得更糟。
Somaclonal variation occurs in tissue and embryo culture even without genetic modification, but genetic modification often makes it worse.
通过回放斑马鱼胚胎的录像，研究者可追寻出组成特定组织比如它眼球上的视网膜的原细胞。
By rewinding the video of a zebrafish embryo, the researchers were able to trace the origin of cells that formed specific tissues, such as the retina at the back of the eye.
彭齐亚斯称赞其为“聪明的方法”，尽管该模型存在一些限制，例如胚胎的临床操作不能定性。
Penzias praises the authors' "clever methodology," though he notes some limitations with the model: how clinicians handled the embryos in the lab was not quantified, for example.
加拿大哈利法克斯·达尔·豪斯大学的一个研究小组发现了一种绿藻对发育中的火蜥蜴细小胚胎的入侵。
A team from Dalhousie University in Halifax, Canada, discovered that a green alga invades tiny developing salamander embryos.
布朗支持想要创造混合胚胎的科学家。这混合胚胎，由人的细胞核植入动物卵细胞，经过几天的发育而成。
Brown supports scientists who want to create hybrid embryos in which the nuclei of human cells are inserted into animal eggs and allowed to grow for a few days.
由于没有谁诉诸体外受精的意外结束了10多余个胚胎，这的确是一个为了细胞株而产生多余的胚胎的音调。
Since nobody who resorts to IVF accidentally ends up with 10 good spare embryos, this is really a pitch to produce extra embryos just for the cell lines.
当黄禹锡在2004和2005年的科学杂志上发表了两篇论文声称他已经克隆了人类胚胎的时候，整个科学界都震惊了。
Hwang stunned the scientific world when he claimed in two papers published in Science in 2004 and 2005 that he had cloned human embryos.
其后，每一个胚胎的未成熟干细胞—含有99%的人的DNA—能够培育成脑、皮肤、心脏和别的组织，用以治疗畸形症等。
Then each embryo's immature stem cells - containing DNA that is 99 per cent human - can be harvested and used to create brain, skin, heart and other tissue for treating crippling diseases.
理论上，这些数据可以用来分析胚胎的DNA，确定它是否比较可能成长为带有特定眼睛、头发和皮肤颜色的孩子。
In theory, these data could be used to analyze the DNA of an embryo and determine whether it was more likely to give rise to a baby of a particular hair, skin or eye tint.
“我们不愿意看到毁灭胚胎的干细胞研究，”斯托达特先生说，“胚胎是流了产的人类生命，应该受到保护而不是毁灭。
“We do not want to see stem cell research that would destroy embryos, ” Mr. Stoddart said. “Embryos are preborn human life that should be protected and not destroyed.
“我们不愿意看到毁灭胚胎的干细胞研究，”斯托达特先生说，“胚胎是流了产的人类生命，应该受到保护而不是毁灭。
“We do not want to see stem cell research that would destroy embryos, ” Mr. Stoddart said. “Embryos are preborn human life that should be protected and not destroyed.
应用推荐