Given what we know, we can confirm that this statement is in fact true in that grey tails seem to be the more dominant trait.
In genetics, we refer to a trait as dominant when it has the capability of overriding the existence of another variation of that trait. This means that if a mouse has the genetic code for both a grey and a white tail, the mouse will be born with a grey tail because this trait is dominant, which is the reason that in this situation more mice have grey tails.
Therefore, we can confirm that this statement is in fact true in that grey tails seem to be the more dominant trait.
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