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 $II$
$A$. Leptotene	$i$. Nucleolus disappears
$B$. Zygotene	$ii$. Formation of recombination nodules
$C$. Pachytene	$iii$. Development of synapsis
$D$. Diplotene	$iv$. Chromosomes appear as thread-like structures
$E$. Diakinesis	$v$. Gene exchange occurs via chiasmata

Bivalent or Tetrad formation is a characteristic feature observed during:

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