Because each homologous chromosome consists of two chromatids

Because each homologous chromosome consists of two chromatids

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Because each homologous chromosome consists of two  chromatids, there are actually four chromatids aligned next to  one another.  This combination of four chromatids is called a  tetrad , and the  coming together is the process called  synapsis After synapsis has taken place, the process of crossing over  occurs.  In this process, segments of DNA from one chromatid in the  tetrad pass to another chromatid in the tetrad. 
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This note was uploaded on 12/07/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.

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Because each homologous chromosome consists of two chromatids

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