( ( Genes ( carried ( on ( the ( sex chromosomes ) ) ) ) ) ( ( are ( said ( to ( be sex-linked ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Genes)) (VP (VBN carried) (PP (IN on) (NP (DT the) (NN sex) (NNS chromosomes))))) (VP (VBP are) (VP (VBN said) (S (VP (TO to) (VP (VB be) (ADJP (JJ sex-linked))))))) (. .)))
Genes carried on the sex chromosomes are said to be sex-linked.
(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))))))) (. .)))