This normal weight animal like this has its whole equilibrium thrown off, its homeostasis thrown off when its dietary conditions change.

在饮食条件发生变化时,这些正常体重动物的生理平衡被打破,于是摈弃了原来的平衡饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

They're not chromosomal differences because this is the ordinary process of mitosis.

它们的染色体没有任何变化,因为这是正常的有丝分裂过程

耶鲁公开课 - 生物医学工程探索课程节选