How many chromosomes will the cell have at G_ | vedclass

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(B) In the cell cycle,the number of chromosomes remains constant during the $G_{1}$ phase,$S$ phase,and $G_{2}$ phase.During the $S$ phase,the amount

Vedclass · Accepted Answer

$14, 14, 14$

Vedclass · Answer

(B) In the cell cycle,the number of chromosomes remains constant during the $G_{1}$ phase,$S$ phase,and $G_{2}$ phase.During the $S$ phase,the amount of $DNA$ doubles,but the number of chromosomes remains the same because the sister chromatids remain attached at the centromere.In mitosis ($M$-phase),the sister chromatids separate,but each chromatid is considered a chromosome,so the chromosome number in the daughter cells remains equal to the parent cell.Therefore,if a cell has $14$ chromosomes at interphase,it will have $14$ chromosomes at $G_{1}$,$14$ chromosomes after the $S$ phase,and $14$ chromosomes after the $M$-phase.

Column-$I$	Column-$II$
$(1)$ $G_1$-phase	$(a)$ Interval between $DNA$ replication and $M$-phase
$(2)$ $G_2$-phase	$(b)$ Interval between $G_2$ and $G_1$ phase
$(3)$ $S$-phase	$(c)$ Interval between $M$ and $DNA$ replication
$(4)$ $M$-phase	$(d)$ Interval between the beginning and end of interphase

Column-$I$	Column-$II$
$(1)$ $G_2$ phase	$(p)$ Quiescent stage
$(2)$ Centriole duplicates	$(q)$ Protein are synthesized
$(3)$ Cell cycle	$(r)$ $S$ phase
$(4)$ Heart cells	$(s)$ Growth and division

How many chromosomes will the cell have at $G_{1}$,after $S$ and after $M$-phase respectively,if it has $14$ chromosomes at interphase?

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As there occurs more and more condensation of chromatin during cell division,there occurs:

Choose the correct option for the formation and disappearance of the bipolar spindle in a cell,respectively.

Match the following:
Column-$I$ Column-$II$
$(1)$ $G_2$ phase $(p)$ Quiescent stage
$(2)$ Centriole duplicates $(q)$ Protein are synthesized
$(3)$ Cell cycle $(r)$ $S$ phase
$(4)$ Heart cells $(s)$ Growth and division

Name the stage of the cell cycle at which the following events occur:
$(i)$ Chromosomes are moved to the spindle equator
$(ii)$ Centromere splits and chromatids separate
$(iii)$ Pairing between homologous chromosomes takes place
$(iv)$ Crossing over between homologous chromosomes takes place

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