Quick genetics question

[Lunasly]

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E.g., When a passage presents a certain gene using the following terminology:

LHP^(+/+) and NBM^(-/-)

The +/+ and -/- are intended to be superscripts. I think it implies that the gene is present if its +/+ and not present if its -/-. However, why are there two +'s and two -'s? Is that to indicate each allele of a gene? In other words, if you had the gene LHP^(+/-), this would indicate that one of the alleles of the gene is not present?

Thanks for the help.

 

[justadream]

@Lunasly

+/+ is homozygous wild-type.
-/- is homozygous recessive
+/- is heterozygous