Answer: gravity and an environmental factor
Explanation:
The x-axis shows the relative
amount of DNA per cell thought not directly. This can be seen through a
histogram a specific type of a graph. Looking at the bars of the histogram you
can follow peaks and dips which correspond to something like fluorescence which
indirectly shows the relative amount of DNA in cell.
Answer:
The yellow allele could start to become dominant, or the ones without that allele would die out.