the F8 gene is found on the X chromosome. individuals that are heterozygous are carriers, they won't suffer from haemophilia but their offspring may
explain why a male (XY) will not be a carrier of haemophilia
males carry only one allele of the F8 gene
this means that there isn't another allele to mask the presence of haemophilia
explanation: males will either be affected by sex-linked conditions on the X chromosomes or they won't (depends on genotype), they can't be carriers
