Little research has been done on genetic diversity in west-coast scallops.  However, a study on weathervane scallops Patinopecten caurinus in the Gulf of Alaska and southeastern Bering Sea by researchers primarily from the Alaska Department of Fish and Game reveals little genetic differentiation.  Weathervane scallops, as other west-coast scallop species, produce a veliger larva that is free-swimming and that disseminates widely for several weeks.  Gaffney et al. 2010 Can J Fish Aquat Sci 67: 1827.

NOTE surveyed at nuclear loci with allozyme, microsatellite, and single nucleotide polymorphism (SNP) methods, and at mitochondrial (mt)DNA loci with SNPs and nucleotide sequencing

NOTE  the species is touted as being the largest scallop in the world (shell length to 25cm). It is hard to find any information on the origin of its common name. Perhaps it, or its ecological homologue Pecten maximus in Europe (to 17cm), when fastened to a stick on the roof was large enough to show wind direction

Weathervane scallop Patinopecten caurinus 0.7X
The evident shell coloration at the base of
the shell likely indicates age at 1yr