NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice
For a somatic cell with 2n = 4. Which of the following is true? (Note:- G 1 - growth phase 1, G 2 - growth phase 2, M- Metaphase, P - Prophase and T - Telophase)
Options
- ANumber of chromatids in G 2 = 4, Number of chromosome in G 1 = 4
- BNumber of chromatids in G 1 = 8, Number of sister chromatids in T = 8
- CNumber of chromatids in P = 8, Number of chromosomes in G 2 = 4
- DNumber of Chromatids in G 2 = 4, Number of Chromosomes in M = 8
Correct answer
C. Number of chromatids in P = 8, Number of chromosomes in G 2 = 4
Step-by-step solution
Somatic cells undergo mitotic cell division so, there is no reduction division and chromosome number remain the same. At the beginning of mitosis, there are 4 chromosomes, and each chromosome replicates during S phase and form sister chromatids. So the number of chromosomes is 4, and chromatids are 4 x 2 = 8. Hence, during G 1 phase Chromatids number - 4 Chromosomes number- 4 During S phase Chromatids number - 8 Chromosome number – 4 During the G 2 phase Chromatids number - 8 Chromosomes number - 4