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faltersainse [42]
3 years ago
7

Down syndrome is caused by __________, resulting in three copies of chromosome 21.

Biology
2 answers:
scZoUnD [109]3 years ago
6 0
Down syndrome is caused by nondisjunction, resulting in three copies of chromosome 21. (Normally we just have two)

Hope this helps~
iren [92.7K]3 years ago
5 0
<span> the error occurs at random during the formation of an egg or sperm.</span><span>Down syndrome is caused by a random error in cell division

</span>
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