Doctor insights on:
How Is Down Syndrome Transmitted From Parent To Offspring
Most new mutations: Progeria is a self limited process with most recorded cases appearing as new mutations in families that have other normal children. There are rare sibships reported indicating an autosomal recessive form exists.Most don't survive their teens.The oldest on record died at 27. ...Read more
What is the risk of a trisomy 21 parent passing on the condition to his/her offspring? Should adults with Down syndrome be dissuaded from reproducing
X linked or new mutn: The md's can arise as a new mutation in a child or an asymptomatic carrier mother on one of her x chromosomes. As a recessive gene, it will not express when balanced by a normal gene, but can express in male offspring since a carrier x is paired with a y. If mom is a carrier, there is 50% risk with any male pregnancy to have an affected male. ...Read more
Is it possible to attain a genetic muscular disease without the parents carrying the recessive gene?
Yes : By the unfortunate circumstance of mutation.Get a more detailed answer ›
Hemochromatosis: is it possible to inherit both mutated genes from one parent, or is it always one from each parent?
One per parent: It's exceptional to inherit two alleles at one locus from a single parent, though there's some exceptional cases. Here's a heads-up, though -- hemochromatosis can occur in someone with just one dose if he/she takes in a lot of iron for some reason. Of all the highly lethal common diseases, hemochromatosis is the easiest by far to manage. ...Read more
Yes and no: Autism is complicated disorder genetics of which are not well understood. There is no single gene that causes it and there multiple genes responsible. As a rule of thumb if a parent has autism the chances of transmitting to children becomes higher or at least aspects of it get passed on to next generation. ...Read moreSee 3 more doctor answers
When a child is born with extra chromosomes is that a genetic trait from the father side or the mother side? Or can it go both ways?
Both but not a trait: During formation of either egg or sperm (gametes), the chromosome (c) pairs that make up the normal cell separate & each gamete is supposed to have 1/2 of a pair. If any pair does not separate, three rather than a pair of that c be in the embryo. Having an extra c in every cell of the fetus confuses development.Miscarriage or birth defects often occur.This is not a trait but an error in whole cms. ...Read moreSee 1 more doctor answer
If a lady with ais syndrome does get successfully pregnant through ivf/donor egg is there any risk of the child inheriting the syndrome from birth mum?
AIS: No, ais cannot be passed through child-birth, but a lady with ais cannot be pregnant either. She has no uterus or oocytes so she can't either carry a child nor contribute eggs for conception in a gestational surrogate. If the oocytes are from a separate egg donor, the risk of ais is low, as in the general population. ...Read moreSee 1 more doctor answer
Any pregnancy @ risk: There is a risk of unexpected outcome with any pregnancy of at least 4%.(premi, cleft, chromosome defect) ds risk is present with any pregnancy. Those who want can have the chromosome makeup of the fetus tested during pregnancy. The procedures have risk & should only be used when considering termination.The lowest statistical risk occurs with pregnancy in the early 20's. ...Read more
Is there a type of mosaic Down syndrome that doesn't require the mutation to come from either parent to have a downs child?
Yes: A mosaic down syndrome child can come from a normal egg and normal sperm, produced by normal parents. The fertilized egg would start out normal with 46 chromosomes. It can divide into 2 normal cells, which themselves divide again. If on one of the early divisions, one cell ends up with an extra #21 chromosome and survives to continue dividing, the child will be mosaic with some trisomy 21 cells. ...Read moreSee 1 more doctor answer
Yes: Recessive diseases take 2 gene mutations;one from each parent. Dominant disease take only one gene. ...Read more
Usually not: Svt can be part of heritable cardiac conditions, so in that sense the svt can be passed down by parents. But the arrhythmia itself usually is not per se inherited. An echocardiogram and electrocardiograph ordered by your doctor will help sort this out. ...Read moreSee 2 more doctor answers
Can a person with Lyme disease pass it to their children? Can the father whom is infected with the virus pass it onto his children during conception?
Yes and yes: If the mother has lyme disease, it can be passed to the fetus during pregnancy. If the infected mother is treated with a conservative dose of antibiotics during preg, lyme doesn't circulate so doesn't infect fetus. Infected male partner can pass the infection through semen to partner. Lyme is a bacteria not a virus. ...Read more
Does a child have klinefelter syndrome due to his own mutation or due to mutations his parents carry?
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