X-linkage exhibits a crisscross pattern of inheritance.
   Recessive  X-linked  alleles  such  as color blindness are passed from
   homozygous mothers to all sons.
   Heterozygous females are carriers and pass the allele to half of their
   sons, who develop the disorder.
   Affected  fathers  pass  the  allele to his daughters, who are usually
   carriers.