这就要考虑狗的物种变异，族类，智力，表情和身体特性。
For this to happen the variables of species, breed, intellect, emotion and the physical traits of the canine have to be considered.
许多科学家都认为，国内的狗更显示形态比任何其他已知的物种变异，人类有选择育种的感谢。
Many scientists agree that the domestic dog displays more morphological variation than any other known species, thanks to selective breeding by humans.
正是在环球航行返回几个月之后，达尔文才第一次真正严肃地思考进化- - -或者“物种变异的”可能性。
It was a few months after returning from this voyage that Darwin first began to consider seriously the possibility of evolution, or the "transmutation of species."
达尔文认识到物种含有大量的变异，其中一些能够遗传。
Darwin recognized that species contain vast amounts of variation, some of which could be inherited.
然后我们才能真正地开始寻找该物种的种内遗传变异，并获得和耐药性或毒力有关的一些基因的信息。
Then we can really start to look at the genetic variation within the species and gain insight into some of the genes involved in drug resistance or virulence.
这是因为病毒性疾病一般发生在病毒的宿主从某个物种跳跃到另一个物种，继而进化以利用新宿主的方式变异之后。
That is because new viral diseases generally happen when a virus mutates in a way that allows it to jump species, and then continues to evolve to exploit its new host.
但是其它一些变异则对一个物种的生存和繁殖意义重大。
But the rest can play a role in how well organisms survive and reproduce.
该理论是指突变有助于变异性而变异性则是一个物种在面对不断变化的环境时成功生存的助力。
The idea is that mutation contributes to variability and variability drives the success of a population in the face of a changing environment.
科学家们已经观察到一些物种出现了一种令人不安的基因变异现象，这些都是当时那场世界上最严重的核事故，给这里长期留下的至今仍能让人见得到的恶果。
Scientists have observed that other species show signs of troubling genetic changes, evidence of the continuing long-term aftermath of what is still seen as the world's worst nuclear disaster.
不仅仅是人类和人类身边的猫、狗、羊及其它物种有大量基因变异。
Nor is it just humans and our entourage of cats, dogs, sheep and company, that have lots of versions of lots of genes.
甘肃升sushengGan是卡奈尔大学的分子生物学家，说改组使用的变异物种只稍微推迟了树叶的衰老表象，这不是很理想的模型。
And Susheng Gan, a molecular biologist at Cornell University, says the mutant type used by the group shows only slightly delayed leaf senescence, making it a less-than-ideal model to work with.
我们可能会想到人类自身是“进化程度最高的”物种，但就人类已经经历多少轮的变异和选择而言，我们是进化最少的物种之一。
We might like to think of ourselves as the most "highly evolved" species but, in terms of how many rounds of mutation and selection we've undergone, we are one of the least evolved species.
没有遗传变异，一个物种就缺乏进化的能力并且无法适应它环境的改变或新的掠食者或是新的疾病。
Without genetic variability a species lacks the capacity to evolve and cannot adapt to changes in its environment or to new predators and new diseases.
从植物种群水平、植物功能群水平到群落水平，地上生物量的年度间变异性逐渐降低，稳定性逐渐增加。
From population level to functional group level, and then to community level, the yearly-variation of aboveground biomass minimizes gradually and stability increases.
这样做成功的机会很小，但如果成功将有很大的回报。他们一旦查明物种间的遗传变异，就有可能知道一些特性是如何及为什么以它们那种方式进化的。
It's a long shot, but if they can detect genetic variations between species they may learn how and why some features evolve the way they did.
在人类与其他物种间、人类群体中及不同年龄段中，唾液酸样物质的表达和功能都有极其重要的变异。
There are important variations in Siglec expression and function between humans and other species, among human populations, and across the age spectrum.
开展对牡丹染色体的研究，不仅可以从细胞水平上了解遗传变异的规律，而且可以研究不同物种遗传的变异。
Studying the chromosome of tree peony, is not only knowing the regular of genetic variation but also studying the species of heredity on the cell level.
它通过选择淘汰，突然变异，基因遗传等规律产生适应环境变化的优良物种。
The better solution is selected out of a sudden mutation, the laws of genetic inheritance and other fine species to adapt to environmental changes.
从共同的祖先那里分离之后，这种基因中的变异越多，说明这个物种的进化就越快。
The more mutations in the gene, the faster that species has evolved since it split from the common ancestor.
遗传再现了生物物种过去适应环境的成功经验，变异则可视为生物个体本身的环境对策。
Heredity reflects the successful experience of adaptation of a species in the past? And variation is the environmental strategies of an individual organism.
组织培养中出现的多倍性细胞团和单倍性细胞，不会引起原二倍体物种的遗传性变异和性状变化。
The polyploidy cell masses and the haploidy cells appeared in the tissue cultures will not result in the hereditary variability and the changes of the character in the original diploid species.
这一变异预示着赖氨酸取代谷氨酸，并且这一变异在物种间传递时也可以得到保存，这也清楚表明在PKST72家族中口吃基因的共同分离。
This variant predicts the substitution of lysine at a glutamic acid residue, which is conserved across species, and showed the clearest evidence of cosegregation with stuttering in Family PKST72.
遗传变异的大小及群体遗传结构与一个物种的进化潜力和抵御不良环境的能力密切相关。
Genetic variation's size and community's genetic structure are closely related with a species' evolution potential and resistance poor surroundings' ability.
结果表明：该属植物种子微形态特征在种的水平上具有分类学意义；同种的不同地方居群间基本类型一致，但也存在一定程度的变异。
The results show that the seeds micro-morphological characteristics have taxonomic and significance at species level and there is little variation existing in different populations.
细胞融合是一种重要的细胞生物学现象，在植物的变异和物种进化方面具有重要的意义。
Cytomixis is an important plant cytological phenomenon and it is of great significance in variation and evolution of plants.
马先蒿属植物以其丰富的花部变异为研究植物的花部进化与传粉适应，传粉生物学以及植物的物种形成提供了理想的材料。
Pedicularis species provide ideal materials to study flower evolution, pollination biology, and plant speciation for their substantial variation in floral design.
马先蒿属植物以其丰富的花部变异为研究植物的花部进化与传粉适应，传粉生物学以及植物的物种形成提供了理想的材料。
Pedicularis species provide ideal materials to study flower evolution, pollination biology, and plant speciation for their substantial variation in floral design.
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