For g1 describe at least one way mistakes during the cell cycle could result in problems

Ans.

G1 (or gap 1) is first stage of cell cycle of cell division in eukaryotes. During G1 phase, cell starts to synthesize mRNA (messenger RNA) and protein molecules, which are necessary for DNA replication in next stage and other processes. At the end of G1 stage, cell moves into S-phase of cell cycle, where DNA replication takes place.

Before entering the S-phase, cell's nutritional content and DNA integrity is checked. If cells in G1 show DNA errors or damaged DNA  (such as breaks in DNA strands), it will lead to problems as 'it will result into formation of daughter cells with damaged or mutated DNA, if not gets repaired.'

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.