SEX LINKED - Females can only be visual, they cannot be split to it. Males can be visual or split to it.
With this group of inheritance, it is an easy way to sex babies. So, there is no need to do any form of surgical or DNA sexing.
RECESSIVE - means both parents have to have this gene to get any visuals. The parent either needs to be visual or split. With these genes, both females and males can be split to it.
DOMINANT - means they cannot be split to the mutation either they have it or they don't.