How many chromosome in G1 phase and G2 phase

Answer 1

This could be a "trick" question. Technically the answer to both parts is 0.

Many times, the cell cycle/mitosis are taught as if the purpose of a cell is to divide. It would be hard to get further from the truth. Each cell in a multicellular organism has at least one specific role to play in the overall functioning of at least one system. Those roles rely on the cells making, using, releasing, etc. proteins. The production of protein requires access to DNA by the "machinery" that starts that process.

A chromosome is two (or one - late in the division of the nucleus) molecule(s) of DNA that are tightly wrapped around proteins called histones. This wrapping pulls the super long DNA molecule into a much more compact form to make it easier for it to be moved around during mitosis or meiosis. The tight wrapping prevents access by the early protein synthesis machinery I mentioned above. During both G1 and G2 a cell is doing its regular job. The DNA is in its "loosest" form in the nucleus to allow access. This loose form is called chromatin. As a result there technically are no chromosomes during either phase.

Between G1 and G2 is the part of the cell cycle called "S," for synthesis (of DNA). If a cell has received a signal to divide, it will move from G1 to S in order to make a second copy of its DNA. I think this question needs rephrasing into something like: "How many copies of each of a cell's DNA strands are present in G1 compared to G2."