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| Column $X$ | Column $Y$ |
| $(1)$ Attachment site of spindle fibers | $(P)$ Cell cycle |
| $(2)$ Pairing of homologous chromosomes | $(Q)$ Kinetochores |
| $(3)$ Exchange of genes | $(R)$ Synapsis |
| $(4)$ Interval between two successive cell divisions | $(S)$ Crossing over |
| 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 |
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