Why only the X chromosome is responsible for colour blindness or haemophilia why not Y chromosome

@ shivam 

colour blindness and haemophillia is a chromosomal disease , 

and the gene which are responsible for these two disease will be only found in the X chromosome and not on the Y chromosome , 

thatswhy , Y chromosome are free from these two chromosomal disorders. 



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The recessive gene responsible for haemophilic trait is only present on non homologous region of X chromosome and has no allele on Y chromosome. hence, only X chromosome is responsible for haemophilia.
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