Robuta

https://eaap.org/distribution-of-honeybee-mitochondrial-dna-haplotypes-in-an-italian-region-where-a-legislative-act-is-protecting-the-apis-mellifera-ligustica-subspecies/
mitochondrial dnaitalian regiondistributionhoneybeehaplotypes
https://pubmed.ncbi.nlm.nih.gov/14585902/
It is concluded that variation in twinning frequency is not associated with MTHFR genotype.
dizygotictwinningassociatedmethylenetetrahydrofolatereductase
https://scirp.org/journal/articles?searchcode=Haplotypes&searchfield=keyword&page=1
scientific researchhaplotypesarticlespublishing