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Biology 13 Online
OpenStudy (anonymous):

Crossing over occurs when... A. tetrads of homologous chromosomes randomly line up in metaphase I. B. sister chromatids are pulled apart at the centromere during anaphase II. C. homologous chromosomes join together to form tetrads during prophase I. D. chromosomes are grouped together into new nuclei during telophase II.

OpenStudy (anonymous):

this is in the diagram i sent you before! ;)

OpenStudy (anonymous):

C.

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