The male human is heterozygous for autosomal gene A and B and also hemizygous for haemophilic gene h, then his genotype will be AaBbXhY because haemophilia is a sex linked trait that is present on X -chromosome. So, the total number of gametes will be abXh,abY,ABXh,ABY,AbXh,AbY aB Xh, aBY. So the proportion of abXh sperm will be 1∕8