And it also means that this individual will also have the disease for that particular phenotype for that particular disease, all other individuals. So we have X lowercase by and X lowercase BX lowercase B, these individuals will be normal. So with this in mind, let's fill out the following pedigree. So we have a male that is normal, and the only time that a male is normal is this, right over here. So we have X lowercase B and Y. And here we also have a normal male.