As you already know in the nucleus of every human cell there are 46 chromosomes. These exist as 22 pairs of homologous pairs of autosomes and one pair of sex chromosomes. The X chromosome is different from the Y chromosome in that it carries more genes that are not present on the Y chromosome. these are sex linked genes.
Example
The gene that codes for colour blindness is both sex linked and reccesive. Here are the five possible genotypes and phenotypes for normal colour vision and colour blindness
C - Normal Vision
c - Colour Blind
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