( ( ( The presence ) ( of ( ( a dimple ) ( in ( ( the center ) ( of ( the chin ) ) ) ) ) ) ) ( ( is ( ( an ( autosomal ( dominant trait ) ) ) ( -LRB- ( ( ( the gene ) ( ( is NOT ) ( located ( on ( a ( sex chromosome ) ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN presence)) (PP (IN of) (NP (NP (DT a) (NN dimple)) (PP (IN in) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (NN chin)))))))) (VP (VBZ is) (NP (NP (DT an) (JJ autosomal) (JJ dominant) (NN trait)) (PRN (-LRB- -LRB-) (S (NP (DT the) (NN gene)) (VP (VBZ is) (ADVP (RB NOT)) (VP (VBN located) (PP (IN on) (NP (DT a) (NN sex) (NN chromosome)))))) (-RRB- -RRB-)))) (. .)))
The presence of a dimple in the center of the chin is an autosomal dominant trait (the gene is NOT located on a sex chromosome).
(ROOT (S (NP (JJ Sex-linked) (NNS traits)) (VP (VBP are) (VP (VBN located) (PP (IN on) (NP (NP (NNS genes)) (PP (IN on) (NP (NN sex) (NNS chromosomes))))))) (. .)))