for SilverBlade86 [correct them if their wrong pplD ]
this is how i under stand it.
Chromosome is the structure that carries the genes.
dominate is a gene that expresses itself visually in a single does. [in this case it expresses in color]
Recessive is a tricky one and often relates to albino. its a gene that must be on both chromosomes of a pair in order to be visually apparent. except when the gene is carried on the sex chromosome [a sex linked gene where no locus exists on the other sex] basically it has to be chromosome of a pair so there is no dominant gene to mask the recessive presence.
sometimes genes are carried on the sex but since all I've ever seen on this cross is female GBA with a male BN i have no idea. but the mix is what we call an incomplete dominance, this is when the dominant gene is not able to fully suppress the recessive gene and as a result both gene is displayed. so the first generation shows appearance of both colors.