Dominant- recessive ; Intermediate; Co-dominant; Sex -limited; Sex - linked In dogs, merle color is a good example of this type of inheritance. cryptorchidism, in which one or both testicles cannot be found in their usual position in the scrotum. Discusses sex chromosomes and sex - linked inheritance. One of the exciting things about expecting a child is wondering if the baby will be a. gene pool all of the genes possessed by all of the members of a population that will sex - linked gene a gene carried on a sex chromosome (X or Y); only X . Hereditary traits are controlled by pairs of genes in the same position on a pair of.