and the use of the oblique case as an accusative. This has prompted much discussion about the relationships between these two languages. Domari was once thought to be a "sister language" of Romani, the two languages having split after the departure from the Indian subcontinent but later research suggests that the differences between them are significant enough to treat them as two separate languages within the Central zone (Hindustani) group of languages. The Dom and the Rom therefore likely descend from two migration waves out of India, separated by several centuries. In phonology, the Romani language shares several isoglosses with the Central branch of Indo-Aryan languages, especially in the realization of some sounds of the Old Indo-Aryan. However, it also preserves several dental clusters. In regards to verb morphology, Romani follows exactly the same pattern of northwestern languages such as Kashmiri and Shina through the adoption of oblique enclitic pronouns as person markers, lending credence to the theory of their Central Indian origin and a subsequent migration to northwestern India. Though the retention of dental clusters suggests a break from central languages during the transition from Old to Middle Indo-Aryan, the overall morphology suggests that the language participated in some of the significant developments leading toward the emergence of New Indo-Aryan languages. Genetic evidence Genetic findings in 2012 suggest the Romani originated in northwestern India and migrated as a group. According to the study, the ancestors of present scheduled castes and scheduled tribes populations of northern India, traditionally referred to collectively as the Ḍoma, are the likely ancestral populations of modern European Roma. In December 2012, additional findings appeared to confirm the "Roma came from a single group that left northwestern India about 1,500 years ago". They reached the Balkans about 900 years ago and then spread throughout Europe. The team also found the Roma to display genetic isolation, as well as "differential gene flow in time and space with non-Romani Europeans". Genetic research published in European Journal of Human Genetics "has revealed that over 70% of males belong to a single lineage that appears unique to the Roma". Genetic evidence supports the medieval migration from India. The Romani have been described as "a conglomerate of genetically isolated founder populations", while a number of common Mendelian disorders among Romanies from all over Europe indicates "a common origin and founder effect". A 2020 whole-genome study confirmed the Northwest Indian origins, and