What Pattern Of Inheritance In A Pedigree Would Allow You To Decide That A Trait Is X-linked?

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aileeny answered
Any trait that  showed up in the males only  would be considered to be sex-linked to the X chromosome.   This is because a male being XY would show the effect and the females who were carriers being XX would obviously have the normal ( non mutant ) X chromosome too, which dominates the mutated one.   A classic example of X linked ( sex linked) traits is Haemophilia who are nearly always male.     But a female haemophiliac is possible but could only be produced from having a haemophiliac father and a carrier mother ( A rare combination) and therefore inheriting two copies of the mutated recessive  x "bleeding" gene. Hope this helps.

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