The term "heterozygous" does not mean,"normal,carrying a recessive trait." In recessive traits,typically there is nothing visible to distiguish hets from non-gene carriers,(one possible exception may be found in Leopards ? yet to be determined conclusively.)There may sometimes be certain markers to look for,however,in non-recessive traits,(various forms of dominant transmissives.)the heterozygous individuals are clearly distinguishable from the non-gene carrying counterparts.examples include Arabesque,Motley,Salmon/Orangetail/hypo,Jungle,(variable,and sometimes less distinct.)etc...many people get the idea that when breeding a mutation to a non-gene carrier,if the trait shows up in half the litter,it means the trait is "co-dominant".In actuality,it doesn't,it means: 1.The trait in question is non-recessive. 2.The expressive individual used in the breeding trial is likely a heterozygous example of the mutation.(when breeding ANY heterozygous individual,recessive,or not,the statistical transmissive result is 50/50...for example: het albino x "normal"=50% hets/50% "normal" )....hope this helps.
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