How would exposure to saxitoxin from algae cause changes in clam populations?

Question

Quizplus · Accepted Answer

Exposure to saxitoxin from algae would not directly cause mutations in the clam's DNA or increase the mutation rates. Instead, it would selectively favor existing mutations in the clam population that confer resistance to saxitoxin. Clams that are not resistant would die off, leading to changes in the overall clam population. Clams do not have a conscious desire to change their transporters, so option E is not a valid choice. Option D is not the best choice, as sensitive clams may not necessarily be able to migrate away from the algae bloom in time to avoid exposure.

How Would Exposure to Saxitoxin from Algae Cause Changes in Clam