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?

Similar Questions

Select the matched ones.
$I.$ $S$-phase - $DNA$ replication
$II.$ Zygotene - Synapsis
$III.$ Diplotene - Crossing over
$IV.$ Meiosis - Shown by haploid and diploid cells
$V.$ $G_{2}$-phase - Quiescent stage

Which of the following types of cell division is a characteristic feature of chondrocytes,the macronucleus of Paramecium,and embryonic membranes?

$S -$ Statement: Cells cannot maintain their efficient size through mitosis.
$R -$ Reason: Meiosis is an important process for evolution.

Which of the following does not occur during interphase?

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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