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Explain Down.s syndrome....

Explain Down.s syndrome.

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**Step-by-Step Solution:** 1. **Definition of Down Syndrome**: Down syndrome is a genetic disorder that is present at birth. It is caused by the presence of an extra chromosome, specifically a third copy of chromosome 21, which is referred to as trisomy 21. 2. **Genetic Basis**: In Down syndrome, there is an alteration at the gene level due to the presence of three copies of chromosome 21 instead of the usual two. This genetic anomaly can occur in all cells (full trisomy) or in some cells (mosaic trisomy). 3. **Symptoms**: Individuals with Down syndrome exhibit both physical and mental disabilities. Common physical characteristics include: - Poor and stunted growth ...
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