why some illnesses and diseases “skip” a generation.
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With X-linked conditions, meaning the gene is located on the X chromosome, sons will show the condition with only one copy, whereas a daughter will need two copies of that gene.
For example, let’s say a colorblind man has a daughter. His contribution to her is an X-chromosome. So his daughter will have one normal X and one colorblind X, she’s a carrier.
When this daughter eventually has kids, her sons will have a 50-50 chance of being colorblind, depending on which X-chromosome they inherit from her.
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