Genetic difference between blue and self blue in OEGBs

Self Blue is also referred to as Lavender. It is a recessive gene/color that is on a completely different locus from Blue, also known as Andalusian Blue from its originating breed. Blue is dominant, but does not breed true, as homozygous (both copies) makes a "splash"

Yes, self blue does breed true.

Self refers to a color that is solid and evenly distributed over the birds entire plumage and does not have any secondary color patterns ( like lacing) associated with the plumage color.

As Illia stated, self blues are actually lavender which is an expression due to a pair of  recessive genes. The two genes dilute a black bird to light gray or blue color. The color is even and covers the entire bird.

Blue is expressed by an incompletely dominant gene. One blue gene produces a blue bird - two blue genes produces a splash bird. Splash is a whitish bird that has splashes of black or blue feathering.

Blue birds on the other hand have black lacing or feather edging associated with the plumage pattern; the head of the female is a darker color (dark blue to black) than the body and in males the pyle region is dark blue or black in color.



Crossing a blue with a lavender will be like crossing a blue with a black. You will get the same results because the lavender is recessive.

Blue X lavender = blue birds and black birds       The blue birds may or may not have lacing or edging it depends genetics of the lavender bird and the blue bird.


Tim

Yes, Blue and black yield 50% blue and 50% black.

Blue on blue yields 50% blue, 25% black, 25% splash.

Slash and black, 100% blue.