我们没有预料到这样的天气突变。
新物种不过是早先物种的突变体。
艾滋病病毒经证实能突变成抗药型病毒。
HIV has proven to possess an ability to mutate into drug-resistant forms.
科学家们已经发现一个似乎是亨廷顿病病因的遗传突变。
Scientists have found a genetic mutation that appears to be the cause of Huntington's disease.
这是一个无声突变，与水牛产奶量无关。
It was a silent mutation and was not associated with the traits of milk yield in buffalo.
在饥荒、疾病和苦难中，气候突变的代价往往很高。
The price of sudden climate change, in famine, disease and suffering, was often high.
此外，创始者突变的单一拷贝通常赋予携带者生存优势。
Furthermore, the single copy of a founder mutation often confers a survival advantage on carriers.
天气突变。
他们推断，沉默基因积累随机突变，最终使它们变得无用。
Silent genes accumulate random mutations, they reasoned, eventually rendering them useless.
如果一个复制的基因与原来的有些许不同，那就叫做基因突变。
If a copy of a gene is a bit different from the original, that's called a genetic mutation.
东非和北欧的养牛人发生了一种突变，帮助他们像成年人一样消化牛奶。
Cattle raising people in East Africa and northern Europe have gained a mutation that helps them digest milk as adults.
突变是所有基因差异的最终原因,包括人类和香蕉，海星和伞菌之间差异。
Mutations are the ultimate cause of all the genetic differences, including the differences between a human and a banana, between a starfish and a toadstool.
例如，在果蝇身上，研究人员发现了基因震荡器，这种突变导致果蝇在麻醉下剧烈摇晃。
For example, in the fruit fly, researchers have identified the gene Shaker, mutations in which cause flies to shake violently under anesthesia.
随着新等位基因在每个群体中独立突变产生，它们在许多遗传位点上的等位基因频率逐渐变得越来越不同。
Their allele frequencies at numerous genetic loci gradually become more and more different as new alleles independently arise by mutation in each population.
大多数明显的创始人突变都是隐性的，可以解释这种明显的异常现象：只有双亲都拥有受影响基因副本的人才会生病。
This apparent anomaly is partially explained by the fact that most founder mutations are recessive: only a person with copies of the affected gene from both parents becomes ill.
在研究玉米的基因构成时，芭芭拉·麦克林托克发现了一种新的突变基因，这一发现使人们对细胞分化有了更深入的了解。
While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.
存在着冲突变得国际化的危险。
他的情绪突变搞得她全然不知所措。
局势风云突变，战争一触即发。
A hair-trigger situation has been created which could lead to an outbreak of war at any time.
创始者突变是一类引起疾病的基因突变，每一种都源自其自身祖先的“创始者”。
Founder mutations are a class of disease-causing genetic mutations, each derived from its own ancestral "founder" in whom the mutation originated.
例如，因为突变的基因可以提高铁的吸收效率，所以遗传性血色素沉着病突变可以保护带菌者不缺铁。
For example, the hereditary hemochromatosis mutation protects carriers from iron-deficiency because the mutated gene allows increased efficiency of iron absorption.
虽然大多数致病突变在人类中发现的概率为千分之一到百万分之一，但基础突变发生的几率可能高得多。
While most disease-causing mutated are found in humans at a rate of one in a few thousand to one in a few million people, founder mutation can occur at much higher rates.
突变株产生核糖霉素的同时基本未产生新霉胺。
This mutant produces ribostamycin, but almost no neamine is produced.
应用推荐