Which axis indirectly shows the relative amount of dna per cell? by what relationship? which axis indirectly shows the relative amount of dna per cell? by what relationship? the y-axis; the dna was stained, so there is a positive correlation between fluorescence and dna content. the x-axis; the dna is naturally fluorescent so there is a positive correlation between fluorescence and dna content. the y-axis; dna content was the dependent variable. the x-axis; the dna was stained, so there is a positive correlation between fluorescence and dna content?