After mixing a heat-killed, phosphorescent strain of bacteria with a living non-phosphorescent strain, you discover that some of the living cells are now phosphorescent. Which observations would provide the best evidence that the ability to fluoresce is a heritable trait?
a. DNA passed from the heat-killed strain to the living strain.
b. Protein passed from the heat-killed strain to the living strain.
c. The phosphorescence in the living strain is especially bright.
d. Descendants of the living cells are also phosphorescent.
