how many copies of genome are present in a diploid cell in G1 phase?
....and therefore can not help you and my answers might just confuse you. However the same rationale applies to physics and chemistry and please do not mislead students.
https://www.cellsalive.com/cell_cycle.htm
only mRNA has been produced. The DNA has not separated into haploid sequences in G1
In a diploid cell during the G1 phase, there is a total of 2 copies of the genome. Each copy is called a homologous chromosome.
To understand why there are 2 copies, we need to consider the definition of a diploid cell. A diploid cell contains two sets of chromosomes, one set inherited from the mother and the other set inherited from the father. Therefore, there are two copies of each chromosome in a diploid cell.
During G1 phase, the cell is in the first gap phase, where it prepares for DNA replication. The DNA is in the form of unreplicated chromosomes, which means each chromosome consists of a single chromatid. So, at this stage, there are 2 copies of each unreplicated chromosome, making a total of 2 copies of the entire genome.
It is worth mentioning that during the subsequent S (synthesis) phase of the cell cycle, the DNA is replicated, resulting in each chromosome having two sister chromatids. This means that at the end of the S phase, each diploid cell will have 4 copies of the genome, which are later distributed equally during cell division. But specifically in the G1 phase, there are 2 copies of the genome.