This susceptibility might not be due merely to ethnic genetic differences.
这种易感性可能不仅仅是由于民族遗传差异。
2
It is now known that genetic variability accounts for 25% of susceptibility to the disease, but that variations in the sickle-cell gene contribute to only a fraction of that.
现在，25 %的对疾病的敏感性被归咎于遗传变异。但在镰细胞基因上的变异仅仅参与了其中的一小部分。
3
Because twins share genes, but may have different exposures to environmental factors, studying twins allows an, "opportunity to control for geneticsusceptibility."