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Description
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DOMINANT gene: this gene will only need to appear once between the two alleles to express.
RECESSIVE gene: this gene NEEDS to be coded on BOTH alleles to appear.
Co-dominance: this gene has an in-between between two alleles (ie mink point)

Gene 1: Hair Length.   SH= short hair (DOMINANT)
  sh= long hair (RECESSIVE)

  SHSH = short hair
  SHsh = short hair
  shsh = long hair

Gene 2: Presence of Hair.   H= cat has hair (DOMINANT)
  h= no hair (RECESSIVE)

  HH = hair
  Hh = hair
  hh = hairless

Genes 3 and 4: Color.
BLACK
(co-dominant gene!)
  BB = pure black
  Bb = chocolate
  bb = cinnamon

RED
  OY = red cat with testes.
  oY = black cat with testes.
  OO = orange cat with uterus.
  Oo = tortie cat with uterus.
  oo = black cat with uterus.
  OoY = tortie cat with testes. (klinefelter. very rare)

Gene 5: White spotting.(co-dominant gene!)
  WW: 50-100% white
  Ww: 1-50% white
  ww: 0% white

Gene 6: Agouti.   T= Agouti (DOMINANT)
  t= Solid (RECESSIVE)

Agouti is what makes cat hairs stripey so they can express tabby genes! All red cats have agouti and will express tabby patterns.

  TT = Agouti
  Tt = Agouti
  tt = solid

Gene 7: Tabby Pattern.In order of dominance (doesnt necessarily reflect irl genetics)
  M: Mackerel
  B: classic
  S: spotted
  T: ticked

EX:
  MB = mackerel
  ST = spotted
  MT = mackerel

Gene 8: Dilution.   D= non dilute (DOMINANT)
  d = dilute (RECESSIVE)

  DD = non dilute
  Dd = non dilute
  dd = dilute

Gene 9: Points.(co-dominant gene!)
  C = solid color, no points (DOMINANT OVER ALL)
  cs = siamese point, white body
  cb = burmese point, colored body
  ca = blue eyed albino
  c = red eyed albino

  CC, Ccs, Ccb, Cca, Cc = solid
  cscs, csca, csc = siamese point ( very light body, dark points)
  cscb = mink point (light body still shows a bit of the pattern underneath)
  cbcb, cbca, cbc = burmese point (body is slightly lighter than the points)
  caca, cac = blue eyed albino
  cc = red (purple-ish) eyed albino

Gene 10: Size.   B = normal sized cat (DOMINANT)
  b = Big cat (RECESSIVE) (think maine coone)

  BB = normal sized cat
  Bb = normal sized cat
  bb = big cat

Gene 11: Tail Length.   T = tail (DOMINANT)
  t = tailless (RECESSIVE)

Warning: tailless and especially cats whose two parents are tailless present a very likely chance of having bone and spine problems.

  TT = tail present
  Tt = tail present or shortened slightly
  tt = tail absent or reduced to a few vertebrae

Gene 12: Folded Ears.   F = folded (DOMINANT)
  f= open (RECESSIVE)

Warning: this gene comes with severe damage to the bone structure and will hinder a cat's ability to perform basic tasks, especially if two folded parents are bred.

  FF = folded (with SEVERE chronic pain and weakness)
  Ff = folded (with light disability and pain)
  ff = open, healthy ears and cartilage

Gene 13: Tufted Ears   T = non tufted (DOMINANT)
  t = tufted (RECESSIVE)

  TT = non tufted
  Tt = non tufted
  tt = tufted

Gene 14: Inhibitor.   I = inhibitor present
  i = inhibitor absent

    II = cat will show silvering
    Ii = cat will show silvering
  ii = cat will not show silvering

Gene 15: Golden.   G = Golden shading present
  g= Golden absent

Interacts with Gene 14 to create the following results:

  GG+II/GG+Ii/Gg+II/Gg+Ii = Chinchilla
  GG+ii/Gg+ii = Golden
  gg+II/gg+Ii = Smoke/silver
  gg+ii = nothing affected

[more genes TBA in the future if you guys are good ;DDD]

ADDITIONAL GUIDELINES:
Blue Eyes:A cat can only have blue eyes if they have:

  caca, cac = blue eyed albino (self-explanatory)
  cscs, csca, csc = siamese point (this form of albinism gives cats baby blue eyes)
  WW, Ww = white spotting, so long as white is touching the eye itself!

(pink-red and lavender eyes are for red-eyed albinos only)

Babies that Change Color: Any Points = kittens are born pure white, then begin to darken over the coming moons. First is the nose, ears and toes
II, Ii = Silvering, the kitten begins life as their base colors only for the silvering/shading to slowly disperse

Stripes:   Black tabby = The stripes are black and the color underneath is brown or dark grey
  Black dilute (aka blue) tabby = The stripes are grey and the color underneath is light brown/blue-grey
Chocolate or cinnamon tabby = The stripes are saturated brown and the color underneath is lighter
Chocolate or cinnamon dilute (aka lilac/fawn) tabby = See above but desaturated and paler

  Silver tabbies = The stripes are full opacity while the color underneath is silver-grey or smoky grey, more clear in areas with longer fur!

  Golden tabbies = Stripes are full opacity, maybe with a coppery hue, while the undercoat is golden, yellow or orange-y~!

Another reminder that red, ginger or cream cats will always show stripes even if they're solid!! This applies to calicoes and tortoiseshells as well, their red portions must still show tabby markings~

Rusting: Have a plain black or blue cat you think looks boring? Fear a tortie's black will look silly next to her ginger tabby splotches? No worries! Rusting is the result of black pigment fading in the sunlight and can give black fur a reddish or greyish hue while grey fur can get a little ruddy. Perfect for adding a little more detail!