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【简答题】
把一只妊娠的白色雌鼠的胚胎细胞核取出来，移入另一只除去细胞核的黑色雌鼠的受精卵内，将这只受精卵在体外培养一段时间，形成胚胎后，在移植到一只灰色雌鼠的子宫里发育，最后生下一只白色。 （1）上述实验说明，鼠的性状是可遗传的，而遗传物质存在于细胞的 中。 （2）上述实验中研究的性状是 ，控制这一形状的是 。 （3）通过该实验可以推论，在生物的传中接代过程中，传下去的是 ，而表现出来的是 ，二者之间的关系是 。
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