Sometimes it is because in the new population, the genetic background for their other genes masks the effect of gene a on depression.
有时，那是因为在新的人群中，人们其他的基因作用下的遗传背景掩盖了基因A对抑郁的效应。
2
As you point out, society needs a better response to depression, and funded provision of therapy for the general population is one solution.
正如你指出，社会需要有一个更好的抑郁反应，并提供资助来使人口疗法成为其中一个方法。
3
Rather than compare the rate of depression and migraine of the relatives to those of the general population, the study compared rates within this isolated population itself.