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  • A cell 100 units of DNA and 50 chromosomes. What would be the number of DNA and chromosomes in G2 phase of the cell cycle?Option: 1 200 DNA & 100

A cell 100 units of DNA and 50 chromosomes. What would be the number of DNA and chromosomes in G2 phase of the cell cycle?

Option: 1

200 DNA & 100 chromosomes


Option: 2

100 DNA & 100 chromosomes


Option: 3

200 DNA & 50 chromosomes


Option: 4

50 DNA & 25 chromosomes


Answers (1)

best_answer

 

G2 phase occurs after the S phase. During S phase, DNA is duplicated. One strand of DNA that makes up a chromosome is duplicated to form two strands. So, before S phase,chromosomes have one chromatid, after S phase each chromosome will have two chromatids. If the initial amount of DNA is denoted as 2C then it increases to 4C. However, there is no increase in the chromosome number. Therefore, 100 units of DNA will become 200 units but the number of chromosomes will remain the same.

Hence, the correct option is (c).

Posted by

Irshad Anwar

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