If one X chromosome is healthy and one is mutated, why does the healthy take control?
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Sometimes you only need one good gene out of two. If you have even one gene for brown eyes, you get brown eyes regardless of the other gene. So if you wanted to not have brown eyes, you’d need the gene for brown eyes to be “missing” on both chromosomes.
If the gene is on the long part of the X chromosome, then women get two shots at having the one gene they need, which can compensate for not having it on the other chromosomes. Men only get one chance, because the gene they would have gotten from their father doesn’t exist on the Y chromosome.
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