If the influence of the home enironmental risk factors depends on genotype, as suggested by these results, genotype-enironment explains the large heritability for asthma and related disorders.

• 象这些结果所显示的一样，如果家庭环境有害因素的影响依赖于遗传型，那么遗传型-环境就能解释其对哮喘和相关病症巨大遗传可能性。