Half Black gene

Half Black exists in two versions. X-Y linked and X-linked . First one readily jumps between X and Y – black is not so expressive. Second one only X-linked – black is much more expressive. Of course whole phenotype look depends on other genes.Very often with Half Black is linked so called Asian Neon gene characterised by white dorsal fin and higher guanine production on peduncle and around dorsal – creating a shiny look to a fish. Of course this gene is also influenced by others in genotype so dorsal won’t always be white. How much phenotypic variation depends on other genes can be seen on example picture of sibling brothers:

czbial21
Photo by Bolesław Gaweł

Half Black: Grzegorz Prusinowski (Akwariusz) examples