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  • You've probably heard people say that if your mother's father was bald you're more likely lose those beautiful locks of hair down the road.

  • But what truth is there to this?

  • It turns out that one of the major contributors to hair loss is sex linked.

  • Humans have forty-six chromosomes of DNA, of which two help determine your sex, the "X" and the "Y" chromosome.

  • If you're a female you have two "X" chromosomes, but if you're a male you have an "X" and a "Y" chromosome.

  • Studies show that the most influential hair-loss gene is located on the "X" chromosome only.

  • What does this mean?

  • Well if you're a male you get an "X" chromosome from your mother, but must receive a "Y" chromosome from your father.

  • Because if you got your father's "X" chromosome you would be a female.

  • So if one of your mothers "X" chromosomes has this hair loss gene you have a 50/50 chance of getting it from her.

  • In this way, hair loss is partially hereditary and passed through the maternal side for males.

  • Females, on the other hand must get two copies of this gene, one on each "X" chromosome in order to physically express it.

  • So if your mother does express these traits it means she will be passing an affected "X" chromosome to you.

  • But why do we say to look at your mother's father?

  • Well, if he has visible male pattern baldness then your mother has at least one copy of the affected "X" chromosome from him,

  • because in order to have a daughter he must have passed on his "X" chromosome, not his "Y".

  • The thing to note here is that this is just one of the contributors to hair-loss and while its thought to be the most significant,

  • many studies have found other hair linked genes which aren't sex linked at all.

  • Including some on the "Y" chromosome, meaning they can be transferred from both the mother and the father.

  • On top of this, some studies have shown correlations between age, exercise, nutrition and even stress levels.

  • So while a quick check of your mom's dad's hair maybe an indicator for future hair loss, a head full of hair on Grandpa's head does not guarantee you are in the clear.

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You've probably heard people say that if your mother's father was bald you're more likely lose those beautiful locks of hair down the road.

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B2 chromosome hair loss hair loss mother father

The Science of Hair Loss/Balding

  • 4131 185
    Carol Chen posted on 2021/12/04
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