PREGNANCY-BIRTH Messages for May, 2002: Re: Difference btw genetic disorder and chromosomal anomaly?

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Re: Difference btw genetic disorder and chromosomal anomaly?

From: Jane (anonymous@obgyn.net)
Fri, 31 May 2002 18:20:14 -0500 (CDT)

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In reply to: anonymous@obgyn.net: "Difference btw genetic disorder and chromosomal anomaly?"

At Fri, 31 May 2002, anonymous@obgyn.net wrote: >
>I used to think that chromosomal abnormality is also a genetic disorder
>so I think they are the same. But recently I read that chromosomally
>normal baby can have other defects caused by genetics. So even if a
>baby has normal chromosome you still can't guarantee that the baby is
>genetically normal?

Normally, chromosomal screening just looks at the number of chromosomes and ensures that they all look normal. But you can have a normal array of chromosomes one or more of which may contain a defective gene. In that situation you will have a genetic disorder despite "normal" chromosomes (in reality, though, there is a defect in the chromosome, because a chromosome is made of genes, and one of the genes is messed up). Does that make sense?

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