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This Australian Shepherd puppy's father is a black-tri; mother is a blue merle. What would cause this dog to have so much white color?

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Are there any general explanations as to why this might happen in nature? Other examples of this kind would also be greatly appreciated.

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  • $\begingroup$ One of the reasons can be related to the migration of the neural crest cells that give rise to the pigmented cells. Many genes are involved in this process. $\endgroup$ – WYSIWYG Nov 27 '15 at 6:38

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