What is the most common chromosomal abnormality resulting in birth defects?

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Down syndrome, also known as trisomy 21, is the most common chromosomal abnormality resulting in birth defects. It occurs when there is an extra copy of chromosome 21 present in the individual's cells. This can lead to a range of physical and developmental challenges, such as intellectual disability, distinctive facial features, and heart defects, among others.

What Is the Most Common Chromosomal Abnormality Resulting in Birth