Bivalent or Tetrad formation is a characteris | vedclass

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(A) During the $Zygotene$ stage of $Meiosis-I$,homologous chromosomes pair up,a process known as $Synapsis$. This pairing is facilitated by the format

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Synaptonemal complex in zygotene stage

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(A) During the $Zygotene$ stage of $Meiosis-I$,homologous chromosomes pair up,a process known as $Synapsis$. This pairing is facilitated by the formation of a $Synaptonemal$ $complex$. The paired homologous chromosomes are called $Bivalents$ or $Tetrads$. Therefore,the formation of $Bivalents$ or $Tetrads$ is a characteristic feature of the $Zygotene$ stage,associated with the $Synaptonemal$ $complex$.

Column $I$	Column $II$
$(A)$ Prophase-$I$	$(i)$ Chromosomes move towards poles with centromeres
$(B)$ Metaphase-$I$	$(ii)$ Half the number of chromosomes are observed
$(C)$ Anaphase-$I$	$(iii)$ Longest phase of Meiosis-$I$
$(D)$ Telophase-$I$	$(iv)$ Two nuclei are observed

Bivalent or Tetrad formation is a characteristic feature observed during:

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