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Autosomal genes are located on non-sex chromosomes. (autosomal inheritance = free inheritance). In contrast to the sex-linked inheritance both male and female have two chromosomes for the location of the genes. The autosomal dominant gene is a gene that is visible even when present only in one chromosome. If a bird has a specific dominant gene, it will show the specific factor. Both male and female can be double-factor or single-factor. A bird can never be split, they either have it and show it, or they don’t have it at all. Here are some mating examples: D = the factor is present   d = the factor is not present  

WHAT IS

AUTOSOMAL DOMINANT INHERITANCE IN BIRDS?

MALE (dd)
F E M A L E
d
D
D
D
d
d
d
d
(Dd)
d
d
d
MALE (Dd)
F E M A L E
d
d
d
d
d
d
D
D
(dd)
d
D
d
MALE (Dd)
F E M A L E
d
D
D
D
d
d
D
D
(Dd)
d
d
d
Male:     without the dominant factor Female: with the single-factor = visible for the dominant factor Results:  50 % single-factor = visible for the dominant factor (Dd)                    50 % without the dominant factor (dd)
Male:     with the single-factor = visible for the dominant factor Female: with the single-factor = visible for the dominant factor Results:  50 % single-factor = visible for the dominant factor (Dd)                    25 % without the dominant factor (dd) 25 % double-factor (DD)          Note: In some bird species the double-factor for some autosomal dominant factors can lead to health problems or the birds will die during the incubating or hatching (= Lethal-Factor). In Example: CANARIES:  - double-factor of Intensity (= lethal) - double-factor of reduction of carotenoids, also called Dominant White   (= lethal) - double-factor Crest(ed) / Corona (= lethal) The double-factor of Superoxidation (= Piel-Negra-Birds) leads to health problems.This canaries have great difficulty with the growth and if they fledged they will not stop the moult. This birds are never used for a good breeding success. The factor Superoxidation is only present in canaries of the black serie.The name comes “Piel-Negra” comes from the Spanish language and means "black skin". BUDGERIGARS: double-factor Crest(ed (=lethal) In some countries this form of mating (Dd xDd) is prohibited for animal welfare reasons. (i.e. Germany).         
Male:     with the single-factor = visible for the dominant factor Female: without the dominant factor Results:  50 % single-factor = visible for the dominant factor (dD)                    50 % without the dominant factor (dd)