It is an autosomal character, a member of the second group of linked gens.
coined 1906 by U.S. cytologist T.H. Montgomery (1873-1912), from auto- + -some (3)). Related: Autosomal.
autosome au·to·some (ô'tə-sōm')n. A chromosome other than a sex chromosome, normally occurring in pairs in somatic cells and singly in gametes.