Nessaboo916
17.12.2019 •
Biology
Me ! i will give
a person with trisomy 21 has an extra copy of chromosome 21. what happened during meiosis that caused the person to get three, instead of two, copies of chromosome 21?
binary fission
crossing-over
genetic recombination
nondisjunction
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Ответ:
Non disjunction
Explanation:
Ответ:
where are the statements
Explanation: