The way to test to see if the tay-sachs gene is present is by getting a blood test done. Everyone has two copies of the tay-sachs gene. This gene is HexA. The tay-sachs disease occurs when a person gene is not working properly and there is a mutation. One working gene and another working gene mean that the person is a carrier for tay-sachs. This still results in asymptomatic carriers, but when two people that are both carriers make a baby, there is an increased risk of the baby developing the disease.
https://my.clevelandclinic.org/childrens-hospital/health-info/diseases-conditions/hic-Tay-Sachs
This image describes how tay-sachs is passed down.
https://www.google.com/search?q=etiology+of+tay-sachs+disease&espv=2&biw=1366&bih=667&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj7j8GuhOLKAhUJwmMKHd5pAFAQ_AUIBigB#imgrc=bTb28nnOjadurM%3A
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