Haplogroup J1, more fully Y DNA haplogroup J-M267, is a Y chromosome haplogroup found in the Middle East. This means it is found in a group of descendants from a single common ancestor in the father's line. It carries a mutation on the Y chromosome known as M267. This type of mutation is called a SNP, or a single nucleotide polymorphism, a change at one position in a gene's DNA.
The origin of this mutation was between 4,000 and 24,000 years ago.
This mutation followed a previous mutation, which created the haplogroup known as haplogroup J-P209 or simply haplogroup J, and so this makes the Y chromosome the "child" of the older version of the Y chromosome. Haplogroup J arose from a mutation which occurred about 31,700 years ago in Southwest Asia.