Before barking on me with that foul mouth, read some latest scientific book to know better. The world has moved since Rakhal Das Bandapadhya wrote that book 100 years ago.
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And I am proud with my Sudra heritage. Why do you think, I would find branding me Sudra is anything humiliating? Brahman, Sudra and other Hindu castes have no relevance for me as neither me nor anyone in my extended family or any known ancestor of mine is a Hindu. Even among Hindus these caste classification do not conform with your notion of physical characteristics. Northern Indian Jat community are Sudra, yet they are as tall and as caucasoid looking as other Punjabis.
Most Bengalis have this Sudra heritage a little or more but it is not something that can be explained just in one straight line.
In any case, some people should not be denied their own Aryan or Semitic heritage by demeaning their history. Pathans are culturally Pathan but if it is DNA they are also mixed with Tajik people from nearby places during the course of history.
Punjabis are also about 30% mixed with Dravidians. Note that Dravidian cities Taxila and Moenjodaro are in Punjab. Like the Aryans, Dravidians also have sharp and high noses although their complexion is dark and features are different.
In the case of Bengali, we were basically mixed during the pre-historic time between Mongolian, Dravidian, and Negroid people. A time came when some Aryan Hindus people came and settled in Bengal, too. Many Muslims arrived from Afghanistan, Central Asia, North India, Arab countries, especially Yemen, and Negro from Ethiopia/ Eritrea during a long period from 1200 AD to 1757.
Note that Ethiopians are not really pure Negro. They are again a mixed-race people between Africans there and Arabs in the east of the Red Sea since pre-historic times. Bengal had a Negro/ Ethiopean Sultan named Sultan Muzaffer Shah. The military was already infested with them.
All of these arrivals to Bengal mixed among themselves during the course of time and finally during the last two centuries with those local Muslims who converted to Islam from all castes of Hindus.
However, Punjabis and Pathans have different types of intermixing that I noted already. This is why our average facial features are different from theirs though many look similar. However, Bihari Pakistanis are very near to our kind of mixing of population.
UP, Delhi and Agra have other types of mixing of foreign Muslims who migrated and settled around those places. They may have mixed with the local Aryan Hindus who converted to Islam.
However, all together we are Muslims of South Asia without distinction.