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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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rixter119 rixter119
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11 years ago
Why can woman be a carrier of a sex-linked trait without expressing that trait in her phenotype, while a man cannot? Please help.
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#1
11 years ago
Sex-linked traits are carried on the X chromosome. A woman has two. If it is a recessive trait, then BOTH X chromosomes must have it for it to be expressed. If only one does, it will not express. A man can carry sex-linked traits without expressing; the thing is, they will be FEMALE sex-linked traits on his X-chromosome. Male sex-linked traits are carried on the Y chromosome, of which there is normally only one, thus there cannot be a recessive male sex-linked trait.
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#2
11 years ago
Because the remaining X chromosome is enough to make up for the deficient X chromosome. In males, there is no alternate X chromosome to fall back on. Women will express an X linked disorder if both the X chromosomes are faulty, that is, if they inherited faulty X chromosomes from both parents. But this is far less common.
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#3
11 years ago Edited: 11 years ago, bio_man
One example of this type of genetics is a disease called Fragile X Syndrome (prominent in Males, extremely rare in females as they must have a father with "FXS" and a mother who is at least a carrier).
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