(D) Bivalents are pairs of homologous chromosomes formed during the $zygotene$ substage of $prophase-I$ of meiosis through a process called synapsis.$

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Zygotene and $S$ phase (of interphase prior to prophase $I$)

(D) Bivalents are pairs of homologous chromosomes formed during the $zygotene$ substage of $prophase-I$ of meiosis through a process called synapsis.$DNA$ replication occurs during the $S$ phase (synthesis phase) of the interphase, which takes place just prior to the onset of meiosis (prophase $I$).

Class 11 Biology Cell Cycle and Cell Division Meiosis

Medium

During which stages (or prophase $I$ substages) of meiosis do you expect to find the bivalents and $DNA$ replication respectively?

AIIMS 2009 All AIIMS

A
Pachytene and interphase (between two meiotic divisions)
B
Pachytene and interphase (just prior to prophase $I$)
C
Pachytene and $S$ phase (of interphase just prior to prophase $I$)
D
Zygotene and $S$ phase (of interphase prior to prophase $I$)

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Chapter

Cell Cycle and Cell Division

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Meiosis

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AIIMS 2009 Paper All AIIMS years →

Which of the following pairs correctly matches the stages of prophase-$I$ of meiosis with the processes occurring in them?

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Crossing over is..........

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During which stage does the chiasmata become visible?

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Match the following columns $I$ and $II$:

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

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