( Sex ( ( linked ( traits ( are ( traits ( that ( are ( due ( to ( alleles ( found ( on ( the ( X chromosome ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Sex)) (VP (VBD linked) (SBAR (S (NP (NNS traits)) (VP (VBP are) (NP (NP (NNS traits)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ due) (PP (TO to) (NP (NP (NNS alleles)) (VP (VBN found) (PP (IN on) (NP (DT the) (NNP X) (NN chromosome))))))))))))))) (. .)))
Sex linked traits are traits that are due to alleles found on the X 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))))))) (. .)))