There are only a few Y-linked genes. Whatever gene a male carries on his single X chromosome is the only copy of that genes that he has. That gene cannot be masked by a corresponding gene on a second X chromosome as they can in females. Red eyed female x white eyed male. X linkage is a special case of the general phenomenon of gene linkage , in which two or more genes tend to be inherited together because they are on the same chromosome.
Genes located on different chromosomes assort independently during meiosis.
Genes located on the same chromosome usually will not assort independently. The exception to this is if there is a cross-over during meiosis. Incomplete Dominance Mendel's situation was unique in that the dominant traits he studied always overpowered or masked the recessive allele. Often however, a heterozygous individual may appear to have a 'blended' phenotype, somewhere between the homozygous dominant and homozygous recessive traits. This is the case with flower color in sweet pea flowers.