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The genetics of red and blond hair are complex .

红发和金发特征在遗传学上比较复杂。

The other field that may be changed is genetics .

另外一个可能被改变的领域是遗传学。

But genetics may not be the only explanation .

但是，遗传学也许不是唯一的解释。

Palaeontology and genetics offer no good evidence for the timing .

古生物学和遗传学没有提供时间方面的良好证据。

Some studies have led experts to believe that genetics is involved .

一些研究该引领的专家相信这与遗传学有关。