In the lab you isolate a chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A)No, because the light absorbed by chlorophyll would be released as heat and thus not used to make ATP or NADPH.
B)No, because the xanthophylls prevent the production of reactive oxygen species.
C)Yes, because the xanthophylls prevent the production of reactive oxygen species.
D)Yes, because the heat released by the xanthophylls would warm up the cells and enhance photosynthesis.
E)No, because mutations never spread in nature.

Question

Quizplus · Accepted Answer

The loss of ability to switch xanthophyll pigments into the inactive form would lead to excess heat being released, which would not be utilized for ATP or NADPH production but would rather dissipate as heat. In a shaded environment, where there is limited light to begin with, this extra heat would not confer any benefit to the cell and would likely be detrimental, leading to decreased fitness. Therefore, this mutation is unlikely to spread in a shaded pond environment.

In the Lab You Isolate a Chlorella Mutant That Is