Black tort vs Tortoise?

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houston

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Hey all, attempting to do some genetic charting and the pedigree I'm looking at (Holland Lop) lists "Tort - Black" and "Tortoise" as colors. The individuals come from the same breeder, so I don't think its a matter of different recordkeeping styles.

Is a "Tortoise" not a black tort (aaB_C_D_ee)? If not, what's the genetics behind it?

Thanks!
 
They're the same color. Could be the breeder changed their record-keeping program between the two, or just wrote something down as short hand. The full correct name for the pattern is Black Tortoise.
 
They probably meant 'tortoiseshell' but many folks shorten it to 'tort'. Generally, unless it's something other than black, it's assumed to be a black based tort.

Required genes for a black based tort are: aa B_ C_ D_ ee. It's the double recessive on the 'e' which makes the tort.

aa B_ C_ D_ ee = 'standard' black based tortoiseshell
aa bb C_ D_ ee = chocolate tortoiseshell
aa bb C_ dd ee = lilac tortoiseshell

Should you breed a tort to a tort but they both carry a recessive 'c', it's possible to get a white tort. That would be: aa __ cc __ ee. For a more rare color, a lilac tort carrying a recessive 'c' bred to another lilac tort carrying a recessive 'c', if you got a REW from that pair, then it would be all recessives: aa bb cc dd ee.
 

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