📚 DNA Breakdown Section

🔍 A Locus (Agouti)

• Ay (fawn/sable): Produces fawn coats.
• at (tan points): Creates tan points (e.g. blue & tan).
• a (recessive black): Must be paired as a/a to express solid black if K locus allows.

🟤 B Locus (Brown/Rojo)

• B (dominant black): Standard black pigment.
• b (recessive): Two copies (b/b) = chocolate/Rojo coat color.

🍫 Cocoa (co Locus)

• co (recessive): Two copies (co/co) = cocoa coloring (separate from chocolate).
• Can combine with d/d to produce lilac tones.

🔵 D Locus (Dilution)

• D (full pigment): Standard.
• d (dilute): Two copies (d/d) dilute black → blue, chocolate → lilac, cocoa → isabella.

🎭 E Locus (Extension)

• Em: Black mask.
• E: Allows full pigment expression.
• e (recessive red): Overrides pigment = cream/fawn appearance, regardless of other genes.

🖤 K Locus (Dominant Black / Brindle)

• K (dominant black): Masks agouti (A locus).
• kbr: Allows brindle pattern.
• ky: Allows expression of A locus patterns (e.g. fawn, tan points).

⚪ S Locus (White Spotting)

• S (solid): No white.
• sp (piebald): White spotting on chest, paws, face.
• sw (extreme white): Mostly or all white coat.

🌈 M Locus (Merle)

• M: Merle pattern. 1 copy = visual merle. 2 copies (MM) = health risk; should be avoided.
• m: Non-merle (standard).

🧵 L Locus (Long Hair / Fluffy)

• L (short coat): Standard bulldog coat.
• l (fluffy): One copy = carrier. Two copies = fluffy bulldog.