If a female carries one allele for an X-linked recessive disorder, she is considered a carrier and may not exhibit symptoms. However, if she carries two alleles for the disorder, she is more likely to exhibit symptoms of the disorder. This is because females have two X chromosomes, so they would need to inherit two copies of the mutated gene in order to express the disorder. This is in contrast to males, who only have one X chromosome and are more likely to exhibit symptoms if they inherit one copy of the mutated gene.
