When radioactive thymine is added to the medi | vedclass

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(C) During the $S$-phase of the cell cycle,$DNA$ replication occurs. $DNA$ is composed of euchromatin (transcriptionally active,loosely packed) and he

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Both heterochromatin and euchromatin

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(C) During the $S$-phase of the cell cycle,$DNA$ replication occurs. $DNA$ is composed of euchromatin (transcriptionally active,loosely packed) and heterochromatin (transcriptionally inactive,tightly packed). Both types of chromatin undergo replication during the $S$-phase to ensure that the daughter cells receive a complete set of genetic material. Since radioactive thymine is a precursor for $DNA$ synthesis,it will be incorporated into the newly synthesized $DNA$ strands of both euchromatin and heterochromatin. Therefore,both types of chromatids will become radioactive.

When radioactive thymine is added to the medium during the synthesis of new $DNA$ in human cells,which of the following chromatids will become radioactive in cells that enter the phase immediately upon contact with radioactive thymine?

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