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A member asked:
Is it true that down syndrome is dominant or recessive?
A doctor has provided 1 answer
No: Down syndrome (trisomy 21) is neither dominant nor recessive. Trisomy 21 means there are 3 copies of chromosome 21 (normal is 2 copies or 1 pair). The terms "dominant" and "recessive" are used to describe particular genes and the traits they produce. A chromosome is a much bigger structure, containing more than thousands of genes. Normal humans have 23 pairs of chromosomes (46 total chromosomes).
Answered 6/11/2018
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