yes sexlink colors are on the sex chromosomes........in birds the female only has one , so far only colors are sex link , no pattern have been found sex link.
ok on sexlink only the male has two gene , hen only has one.
so in your case the male has purple and purple....the hen only has Blue
so chick get one from each parent in case of the male chicks, but female only get one from their father.
so male chicks will be blue/purple....now females...