People with Down syndrome usually have ______ of the 21st chromosome.

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asked Jun 5, 2018 165k views

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Amir Raza · Answer 1 · 2018-06-09T17:05:53+0000

: Humans are normally born w/ 46 chromosomes. There are 23 from the egg and 23 from the sperms. They pair together to create 46. Humans born w/ down sydrome have one extra chromosome instead of having two #21 chromosomes they have three #21's resulting n 47 chromosomes

People with Down syndrome usually have ______ of the 21st chromosome.

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