Biology, 03.05.2021 19:00, rhco4760

PLEASE HELP ASAP 2.) A person with Down syndrome has an extra copy of chromosome 21. What can you infer is most likely the genetic mutation that results in Down syndrome?

Nondisjunction during meiosis
Complete duplication of chromosomes during polyploidy
Translocation during genetic replication
Crossing over during meiosis

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PLEASE HELP ASAP 2.) A person with Down syndrome has an extra copy of chromosome 21. What can you...