Biology, 31.08.2019 10:00 lostcharmedone01

Aperson with trisomy 21 has an extra copy of chromosome 21. what happened during meiosis that caused the person to get three copies of chromosome 21 instead of two copies? a) nondisjunction b) genetic recombination c) crossing-over d) binary fission

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Aperson with trisomy 21 has an extra copy of chromosome 21. what happened during meiosis that caused...

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