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Homologous Chromosomes

12. Meiosis / Homologous Chromosomes / Problem 3

In a trisomy 21 condition, which of the following causes the extra copy of chromosome 21?

A

A mutation in a specific gene of two homologous chromosomes

B

Failure of proper separation of two homologous chromosomes

C

Missing one copy of the homologous chromosomes

D

Duplication of the two homologous chromosomes

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