Question

During the study of mitosis in onion root tip cells, we found 16 chromosomes in each cell. Can you tell how many chromosomes will the cell have at G1 phase, after S phase, and after M phase? Also, what will be the DNA content p of the cells at G1, after S, and at G2, if the content after M phase is 2 C?

Answer 1

It is given that the number of chromosomes present in each onion root tip cell is 16. Hence, the number of chromosomes in the cell will be 16 at G${}_1$ phase, after S phase and after M phase. Also, if the DNA content after M phase is 2C. Hence, the DNA content at G${}_1$ phase will be 2C. It will be 4C after S and G${}_2$ phase.