Comment by jjallen
Because of public family trees potentially linking a genome to a family, no dna is fully anonymous these days.
Because of public family trees potentially linking a genome to a family, no dna is fully anonymous these days.
They would be able to pinpoint your identity (e.g. "this person is the son of both X and Y, and we know who X and Y are").
They know who X and Y are, and also know the identity of their son (you), so that gains them your unique DNA sequence, identified as yours specifically.
The DNA itself is not "anonymous", but I would do it without giving my real name, address, etc. They could know who the DNA is related to, but not gain more information than that.
Even better would be to swap identity with someone else who wants to get sequenced...