There is some evidence from the case of the mollusc Thais lapillus (the dog whelk) on the Brittany coast, that the two chromosome morphs are adapted to different habitats.
Hai algunhas evidencias claras no caso do molusco Thais lapillus (do grupo dos corniños) das costas británicas, de que os morfos de dous cromosomas están adaptados a diferentes hábitats.