They nurture their relatively rare offspring with a large investment of parental care ? milk , shared food and water , and protection from predators 野生马子代的数量不多，因此亲代照顾较为周全，包括充足的母乳、食物和水，以及保护子代不受掠食动物攻击。
2.
The scientists found that uniparental es cells , regardless of parent - of - origin , were able to functionally reconstitute the entire hematopoietic system of adult mice 科学家发现单系胚胎干细胞，不管其亲代来源，可以在功能上重建成年小鼠的整个造血系统。
3.
Howeer , uniparental es cell research faces the biological hurdle of genomic imprinting , in which specific gene expression patterns are dictated by the parental origin 然而，单系胚胎干细胞研究面临着基因组印迹的生物学障碍，即特殊的基因表达模式受原始亲代的控制。
4.
Uniparental cells only hae the imprinting marks for one parental type ( or " from one parent " ) with unknown consequences if harested and transplanted into adults 单系细胞只有来自一个亲代的印迹标记类型（或来自一个亲代）并且在繁殖并移植到成年个体后可能带来未知的后果。
5.
Inheritance patterns and percentage of affected pups in litters indicate that tns is inherited in a recessive manner ( like cl ) with both parents having to be carriers of the disease to produce an affected pup 遗传模式及同窝幼犬中患病者的比率表明tns以隐性方式遗传（与蜡样质脂褐素沉积病一样） ，即亲代双方均为疾病携带者的情况下才能产生患犬。
6.
Where the ranges of two species overlap , and fertile hybrids can be produced , these hybrids will tend to backcross with the most abundant species , so the offspring down many generations come to resemble the most abundant parents 两个物种的重合个体或是那些可育杂种将趋向于与优势种进行回交，因此，经过很多代之后，所得个体会与优势种的亲代相似。
7.
We see in definite variability in the endless slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor 我们在无穷尽的微小的特征中看到不定变异性，这些微小的特征区别了同一物种内的各个个体，不能认为这些特征是由亲代或更远代的?先遗传下来的。
8.
Before the formation of leaves , the nutrition for the development of viviparous plantlet is supplied by its parent , which is a kind of typical foraging behavior . but as to parents , it is a kind of parental breeding behavior and altruism . when talking about heredity and fitness , such a kind of altruism is a sort of egoism too 在胎生苗叶片产生以前，它的营养全部由母体提供，属于全异养阶段，这是一种典型的觅源行为；从母体的角度来看，这又属于一种亲代哺育行为与利他行为；而从遗传与适合度的角度考虑，母体的这种利他行为同时也是一种利己行为。
