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Solution


Q.

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of mitosis, if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after S phase  [2021]
1 32  
2 8  
3 16  
4 4  

Ans.

(2)

In S-phase, the amount of DNA per cell doubles. However, there is no change in the chromosome number. So, in fruit fly the number of chromosomes will remain same, i.e., 8.