Explain how speciation occurred with the Hawaiian snails.

In land snails, a single gene for left-right reversal could be responsible for instant speciation, because dextral and sinistral snails have difficulty in mating. However, the traditional two-locus speciation model predicts that a mating disadvantage for the reversal should counteract this speciation.

In land snails, a single gene for left-right reversal could be responsible for instant speciation, because dextral and sinistrality snails have difficulty in mating. However, the traditional two-locus speciation model predicts that a mating disadvantage for the reversal should counteract this speciation.