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(B) Statement $(I)$ is incorrect because diakinesis is the final stage of prophase-$I$,not the middle phase.Statement $(II)$ is correct; the character

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$II$ and $IV$

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(B) Statement $(I)$ is incorrect because diakinesis is the final stage of prophase-$I$,not the middle phase.Statement $(II)$ is correct; the characteristic feature of diakinesis is the terminalization of chiasmata.Statement $(III)$ is incorrect because the meiotic spindle is assembled during diakinesis to prepare for the separation of homologous chromosomes.Statement $(IV)$ is correct; by the end of diakinesis,the nucleolus disappears and the nuclear envelope also breaks down.Therefore,statements $(II)$ and $(IV)$ are correct.

Choose the correct statements from the following:
$(I)$ Diakinesis is the middle phase of prophase-$I$.
$(II)$ Diakinesis is marked by the terminalization of chiasmata.
$(III)$ Meiotic spindle is not formed during diakinesis.
$(IV)$ By the end of diakinesis,the nucleolus disappears.

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Choose the correct statements from the following:$(I)$ Diakinesis is the middle phase of prophase-$I$.$(II)$ Diakinesis is marked by the terminalization of chiasmata.$(III)$ Meiotic spindle is not formed during diakinesis.$(IV)$ By the end of diakinesis,the nucleolus disappears.