What does the + or - after a gene mean?

[Chars_Chooks]

Hey,
So I have been looking into silver laced wyandotte genetics but I can't figure out what the + or - after the genes mean.

ebeb CoCo db+db+ PgPg MlMl Cha+Cha+ mh+mh+ di+di+ lg+lg+ cb+cb+ i+i+ bl+bl+ Lav+Lav+ C+C+ Mo+Mo+ b+b+ SS Choc+Choc+

This is the genotype for a slw and I understand dominant and recessive genes but I am confused as to what the + means after the allele. If anyone could explain that would be great!

 

[Amer]

+ means it is the wild type allele rather than the mutation.
- is found in female genotypes for sex-link traits since they can only receive one copy of the gene, for example: B/- one copy of barring.

 

[SourRoses]

Math people did it, I'm certain. They like their pluses and minuses. Their slashy thingies.
I would have used ampersands. And slightly longer abbreviations so the language part of the brain can process it easier, rather than the devious math part.
Like "Lav" and "Mot"... but then I wouldn't stop picturing applesauce. Which doesn't look at all like mottling.

 

[Amer]

Math people did it, I'm certain. They like their pluses and minuses. Their slashy thingies.
I would have used ampersands. And slightly longer abbreviations so the language part of the brain can process it easier, rather than the devious math part.
Like "Lav" and "Mot"... but then I wouldn't stop picturing applesauce. Which doesn't look at all like mottling.

No thanks! I don’t want to write the longer abbreviations out! Even though I always forget the symbol for barring, lol. Blue also starts with B so I just get confused.