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1q21.1 deletion syndrome is a rare aberration of chromosome 1.A human cell has one pair of identical chromosomes on chromosome 1.With the 1q21.1 deletion syndrome, one chromosome of the pair is not complete, because a part of the sequence of the chromosome is missing.
Big Brother 21 is the twenty-first season of the American version of the television reality program Big Brother.The season premiered on June 25, 2019 and concluded on September 25, 2019.