I was wondering if i can breed one color with a different color. Do i have to keep them all whites with whites and greys with greys.?Or can i go white with greys and see what happens. Or it isnt a good idea?
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No, they won't be mutts and no, Grey x White does not make Snowy. There is no way to know for sure what you will get without knowing the history of the white bird (and to some extent the Grey as well). White in ducks is recessive and basically masks all other colors when homozygous (resulting in a white bird). If the white bird only has Grey in its' genetic background, you would get all Grey in the first generation cross (F1 generation). When you breed those birds together, you would get 75% Grey and 25% White (F2 generation). 1/3 of the Greys would not carry White genetically, 2/3 would.
Of course, a lot of birds anymore can be carrying other recessive genes (Snowy can be another for example, li^h or harlequin phase.) and as I said, white is also a masking color. You have to sometimes do test crosses to see what you get if you don't know the history of the birds. The percentages I mentioned above though are the basic frequencies you get when you cross a dominant trait to a recessive trait. We all have a tendency to assume that when you mix two colors, you will get a blending of the colors, but that is not how it works (with a recessive trait, it can work in other situations like with an incompletely dominant trait). HTH.