Snail species A has a shell that spirals counterclockwise,but a mutation has caused some individuals to have a clockwise shell.The genitalia of the two versions are incompatible,leading some scientists to say that the clockwise snails are reproductively isolated.This is an example of

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This is an example of mechanical isolation because the physical incompatibility of the genitalia between the two versions of snail species A prevents them from successfully mating and reproducing. Mechanical isolation is a form of reproductive isolation where differences in the size and shape of reproductive organs prevent the mating between two species or variations.

Snail Species a Has a Shell That Spirals Counterclockwise,but a Mutation