A Assuming the life of a cell starts as soon as cell divisio

A) Assuming the life of a cell starts as soon as cell division is completed and ends when the cell starts a new process of cellular division, how many times in a cell’s life does it replicate its DNA? Explain.

B) How is DNA replication related to mitosis?

C) When does a multicellular organism undergo mitosis (when it wants to reproduce, all the time, only when injured, when it’s growing, or when)?

Solution

a) During a cell\'s life, when the cell division has completed there isnt any dna replication since the dna replication and cell division go hand in hand. The number of celldivision is proportional to the number of times the DNA will replicate.

b) Mitosis has four phases- G1, S, G2 and M phase. S stands for synthesis, M for mitosis, G stands for gap phase. Its in the S phase that the DNA replicates in each mitotic cell division, therefore , the number of mitotic cycle, a cell undergoes is equal to the number times a DNA has replicated.

c) A multicellular organism undergoes mitosis at all times, in injury, during growth but not when it wants reproduce- the gametes undergo meiosis (reduction division). Mitosis is the division that takes place in the somatic cells- to replace the injured cells, to increase the tissue mass during growth. For example, our skin cells slough off from the body as they die, to replace these cells the viable cells divide to replace the cells.