Sex Linked Genes

A sex linked mutant gene is when only one of the sex chromosomes is able to carry the gene. For example the female X chromosome may be able to carry a particular mutant gene but the male Y is unable to. Therefore during reduction division the female will pass the mutant gene with the X chromosome to the germ cell but the male can equally pass the mutated gene on the X chromosome or the normal gene on the Y chromosome. Therefore on fertilisation the resultant cell will either contain two mutant alleles and be female or will contain one mutant allele and one normal allele and be male.