数值效应是明显的：退化地区的鲑鱼数量比原始地区少；然而，栖息地的丧失也有可能减少遗传多样性。
The numerical effect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity.
如果同卵双胞胎彼此在疾病方面比异卵双胞胎更相似，那么这种疾病的易感性至少在一定程度上是由遗传造成的。
If identical twins are more similar to each other with respect to an ailment than fraternal twins are, then vulnerability to the disease must be rooted at least in part in heredity.
尽管最近有研究表明环境因素会增加注意缺陷多动症的患病率，但是遗传被视为比环境更有影响作用的因素。
Although recent research has identified environmental factors that may increase the likelihood of developing the disorder, it is thought to have a stronger genetic component.
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