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An animal that is displaying a recessive phenotype (such as lavender) can not be "carrying" a dominant gene (like black). Recessive genes require two copies of that gene in order to be expressed. So any bird with two copies of the lavender gene will be lavender and any bird without two copies of the lavender gene will not be lavender. Since lavender is a dilution gene that affects black, you have either black (no copies of the lavender gene), black split to lavender (black birds that carry one copy of the lavender gene), or lavender (two copies of the lavender gene).
An animal that is displaying a recessive phenotype (such as lavender) can not be "carrying" a dominant gene (like black). Recessive genes require two copies of that gene in order to be expressed. So any bird with two copies of the lavender gene will be lavender and any bird without two copies of the lavender gene will not be lavender. Since lavender is a dilution gene that affects black, you have either black (no copies of the lavender gene), black split to lavender (black birds that carry one copy of the lavender gene), or lavender (two copies of the lavender gene).