Lizanellyhernandez7 Lizanellyhernandez7 11-06-2021 Biology contestada 6/9/2021 Activities - BCHS S. Snyder 2021 Summer Advancement Life Science.1 - NO S.OS OS POR 5. In fruit flies, one genotype for red eyes is written XRXR. The R stands for the dominant allele for red eyes. What does the X stand for?