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What causes the presnce of three chromosomes 21 in Down snydrome? a) Crossing over b) Allele change c) Non-disjunction d) Gene mutation
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2 votes
What causes the presnce of three chromosomes 21 in Down snydrome?

a) Crossing over
b) Allele change
c) Non-disjunction
d) Gene mutation

User John Beynon
by
7.7k points

1 Answer

4 votes
The answer is non disjunction
User Awilinsk
by
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