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  • During which phase(s) of cell cycle, the amount of DNA in a cell remain at 4C level if the initial amount is denoted as 2C ?  Option: 1 G

During which phase(s) of cell cycle, the amount of DNA in a cell remain at 4C level if the initial amount is denoted as 2C ?
 

Option: 1

Go and G1
 


Option: 2

G1 and S
 


Option: 3

Only G2
 


Option: 4

Only M
 


Answers (1)

best_answer

 

 

S - phase (DNA synthesis phase):

  • Following G1, the cell enters the S stage, when DNA synthesis or replication occurs.
  • At the beginning of the S stage, each chromosome is composed of one DNA double helix.
  • Following DNA replication, each chromosome is composed of two identical DNA double helix molecules.
  • Each double helix is called a chromatid.
  • Another way of expressing these events is to say that DNA replication has resulted in duplicated chromosomes, and the two chromatids will remain attached until they are separated during mitosis.
  • If the initial amount of DNA is denoted as 2C then it increases to 4C.
  • However, there is no increase in the chromosome number; if the cell had diploid or 2n number of chromosomes at G1, even after S phase the number of chromosomes remains the same, i.e., 2n.

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The amount of DNA in a cell remain at 4C level if the initial amount is denoted as 2C during G2 only because during M phase, the DNA would be equally divided between the daughter cells, restoring the 2C level.

Posted by

HARSH KANKARIA

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