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Siblings do not have the same mix of genes, thus the difference in full siblings. A good example of this is the Lavender program that Jody has going on. She is breeding her Lavender boy to black hens (if Im understanding this right) with the resultant offspring having 50% the Lavender gene and 50% not. In order to get the Lavender gene to express itself in the next generation, the black hens with the lavender gene are bred back to the lavender roo to produce lavender babies, which will expres themselves as lavender because it got the lavender gene from both parents. The problem will be that she wont know which of those black hens carry that lavender gene until she breed them back, and even then she can't totally discount a black hen that hasnt produced a lavender chick until she has hatched enough eggs out of that particular hen to give a sizable sample. Im not sure I even explained this correctly, and I may be all wrong on this, but the point being that the babies from the lavender and black breeding will not all have the same mix of genes, just like any sibling breedings will not have the same mix of genes, until they are inbred for generations, and even then they wont be identical, ie cloned.
