Down syndrome, caused by an extra copy of which chromosome, is the best known chromosomal abnormality largely because its effects are less lethal than those of other chromosomal defects and most affected infants survive?

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Down syndrome is caused by an extra copy of chromosome 21, which is why it is also known as trisomy 21. This chromosomal abnormality leads to a variety of physical and intellectual disabilities, but many affected individuals can live relatively healthy lives with proper care and support.

Down Syndrome, Caused by an Extra Copy of Which Chromosome