Color and pattern male

Head: lemon-yellow.

Neck: each hackle-feather with a medium-wide bright-blue shaft-stripe, surrounded by a narrow lemon-yellow lace running around the -tip; front of the neck lemon-yellow.

Back and shoulders: lemon-yellow, below the neck-hackle lemon-yellow and blue.

Saddle-hackle: lemon-yellow or lemon-yellow with black shaft-stripes, similar to the neck-hackle, extending from the tip of the feather no more than halfway down.

Tail: steering-feathers bright-blue; support-feathers bright-blue with lemon-yellow lacing; sickles and coverts bright-blue; smaller-coverts with narrow lemon-yellow lacing.

Wings: lemon-yellow , may be partly bright-blue; wing-arch and wing-bar lemon-yellow .

Primary-flights: black lemon-yellow lace on the outside of the outer-vane.

Secondary-flights: inner-vane bright-blue with lemon-yellow lace that runs around the feather tip; outer-vane lemon-yellow  so that when the wing is closed it is complete lemon-yellow.

Breast, flanks, thighs, belly and rear-part: lemon-yellow.

Down: light lemon-yellow or light blue-gray, preferably the latter.

Serious faults

Insufficient or broken shaft-stripes in the neck-hackle. Lemon-yellow in the sickles. Strong presence of black in the parts that should be lemon-yellow. A very irregular lemon-yellow ground-color and/or it's heading towards buff or becoming too pale.

Faults

Serious faults to a lesser degree. Insufficient pattern in tail support-feathers and wing-flights. A slightly uneven, too light or too dark lemon-yellow ground-color. Presence of entire or partial black feather areas within blue. Blue color that is far too dark or far too light.

Color and pattern female

Head: lemon-yellow.

Neck: neck hackle—starting approximately at the junction of the neck and head—featuring a moderately broad, bright blue shaft stripe, entirely surrounded by a narrow lemon-yellow border; feathers on the front of the neck lemon-yellow.

Shoulders: lemon-yellow.

Back: lemon-yellow; between the shoulders, below the neck hackle, bright blue and lemon-yellow.

Tail: main tail feathers bright blue, except for the top two feathers, which are faintly edged with lemon-yellow; tail coverts bright blue with a narrow lemon-yellow edging.

Wings: shoulders and wing coverts lemon-yellow.

Primary flight feathers: bright blue with a lemon-yellow edge on the outer margin of the outer web. Secondary flight feathers: inner web bright blue with a lemon-yellow edge extending around the tip of the feather; outer web lemon-yellow, so that the wing appears entirely lemon-yellow when closed.

Breast, belly, abdomen, and thighs: lemon-yellow.

Down colour: pale lemon-yellow or pale blue-grey; the latter is preferred.

Serious faults

Insufficient patterning in the neck hackle; strong presence of bright blue in areas that should be lemon-yellow on the surface, such as the wing coverts, the sides of the breast, and the flanks; broken shaft-stripe patterning. Also, a highly irregular lemon-yellow ground color and/or a ground color tending towards buff or becoming too pale.

Faults

The above serious faults present to a lesser degree; insufficient patterning in the tail coverts; insufficient patterning in the flight feathers; presence of entirely black or partially black feather areas within the blue patterning; a shade of blue that is far too dark or far too light; a slightly uneven lemon-yellow base color that is too light or too dark.

Genetic code: https://kippenjungle.nl/Overzicht.htm

Website from Henk Meijers with all available information regarding chicken genetics including the world famous: 

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