Most cases of cri-du-chat syndrome are not inherited. Only about 10 percent of people with this syndrome inherit the chromosome with a deleted segment from an unaffected parent. This means the parent carries a chromosomal rearrangement called a balanced translocation, which is passed to their baby, causing them to have the cri-du-chat syndrom.
You can find more information here: ghr.nlm.nih.gov/condition=criduchatsyndr....
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