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A member asked:
My daughter was born with 2 extra chromosomes tested by gene dr. how does that work? no family history of it, maternal grandma had gene mutations.
A doctor has provided 1 answer
Mistake: When conception occurs the chromosomes of the egg & sperm join together as matched pairs, one coming from each parent. To get extra chromosomes either the egg or the sperm had to bring over extra which they got during formation. Statistically the mistake occurs more often in the mother. It is usually a random event & risk increases with maternal age.
Answered 6/30/2018
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Related Questions
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How do a gene mutation and a chromosomal mutation differ?
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Please help! what is the difference between a gene mutation and a chromosomal mutation?
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Mother diagnosis breast ca@ 53, maternal grandpa colon ca at 87, maternal great uncle diagnosis acute leukemia at 65 and his daughter now has acute leuk too.Genetic?
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Aunt (dads sis) and great-grandma (paternal gmas mom) both died of ovarian cancer. Heredity or just bad luck? Cousins tested neg for gene mutation.
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