Why in many molluscs/gastropods, the shell always forms in a clockwise spiral as opposed to a counter-clockwise spiral.

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Why in many molluscs/gastropods, the shell always forms in a clockwise spiral as opposed to a counter-clockwise spiral.

In: Biology

Apparently [there’s a gene responsible for that](https://www.nature.com/articles/d41586-019-01515-w). Don’t know why clockwise is the default, though.