.
>
> For Knut: One study showed that it is in puberty when the sperm are being
> formed in the young male body (around 9 years old) and in the female body
> when the eggs are being formed that the effect is marked. But it seems to
> be more general in that.
>
The theory is that tags are attached to the DNA of the eggs and the sperm
giving instructions as to which genes are to be switched off (or on?). Thus
males and females have differing effects when a switch is applied.
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