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AP Biology/Unit 5: Heredity
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Evidence for Nondisjunction

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Which of the following provides the best evidence that nondisjunction has occurred?

A

The production of four sperm cells in spermatogenesis

B

A dihybrid cross resulting in a 9:3:3:1 ratio

C

Individuals with Down syndrome having three copies of the 21st chromosome

D

The formation of Barr bodies in female cells

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