目的：了解早发型与晚发型单相抑郁症之间是否存在遗传效应的差异。

Objective: To explore the possible differences of genetic effects between the early onset and late onset unipolar depression.

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单词获得年龄效应是指早获得的词比晚获得的词加工快。

Age of acquisition effect is that words acquired earlier are processed faster than those acquired later.

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晚季加性和显性效应基因共同控制谷粒充实，但以加性效应为主，总遗传效应变化幅度较早季小。

Additive- and dominant-effect genes governed grain filling commonly and the fonner acted mainly with less variation range of total genetic effects in late season, compared to that in early season.

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