 and
female to get male Sex-Linked Yellow Cheek babies. A bird cannot be split to a dominant mutation. You either see
it or you don't. A single factor dominant bird has one X chromosome containing the mutation. A double factor dominant
has two X chromosomes, hence only males can be double factor.
Dominant Silver is a mutation that is dominant to other mutations to produce a silver or light grey. The most
obvious difference between the Dominant and the Recessive is the the Dominant has dark eyes verses the red eyes of the recessive.
The birds can carry the dominant gene on one or both chromosomes, with the coloring effect being more pronounced in double-factored
birds. When the dominant silver gene is carried on one chromosome, it is single-factored and the single factored is darker.
When Dominant Silver gene carried on both chromosomes, it is double-factored and is a lighter grey.
Dominant Yellow Cheek
The Dominant Yellow Cheek is very similar to the Sex-Linked Yellow Cheek. Personal observations of the
ones I have seen is that the Dominant Yellow Cheeks has a slight orange tinge, possibly due to a double factor, to it but
lighter than the yellow-orange of a Pastel's cheek patch. Single factor cheek patches are yellow.
The Normal Grey is the what all other mutations are derived from and is the Normal Grey Cockatiel seen in
the wilds of Australia. The male Normal Grey has dark grey feathers over his entire body, excluding the white wing bars,
yellow face, and bright orange cheek patches. Young Normal Grey Cockatiels of both sexes look a lot like female Normal
Greys. The face is Grey with dull orange cheek patches along with tail feathers that have a white or yellow barring on the
underside. If you see a few white or yellow feathers on the back of your normal grey cockatiel's neck and head, sometimes
called ticking, that it means that your cockatiel is split to the recessive mutation Pied.