Describe the changes observed during the synt | vedclass

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(D) During the $S$-phase (synthesis phase),the following events occur:$1$. $DNA$ replication takes place,leading to the doubling of the amount of $DNA

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(D) During the $S$-phase (synthesis phase),the following events occur:$1$. $DNA$ replication takes place,leading to the doubling of the amount of $DNA$ per cell.$2$. If the initial amount of $DNA$ is $2C$,it increases to $4C$.$3$. However,the number of chromosomes does not increase. If the cell had $2n$ chromosomes at the $G_1$ phase,the number of chromosomes remains $2n$ at the end of the $S$-phase.$4$. Histone proteins are synthesized to package the newly replicated $DNA$.$5$. In animal cells,the centriole duplicates in the cytoplasm alongside $DNA$ replication.

Describe the changes observed during the synthesis phase ($S$-phase).

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