( Alleles ( ( ( ( are not ) always ) ( ( dominant or ) recessive ) ) ; ) )
(ROOT (S (NP (NNS Alleles)) (VP (VBP are) (RB not) (ADVP (RB always)) (ADJP (JJ dominant) (CC or) (JJ recessive))) (: ;)))
Alleles are not always dominant or recessive;
(ROOT (S (NP (NP (DT An) (NN allele)) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (ADVP (RB always)) (VP (VBN expressed) (PP (IN over) (NP (DT another)))))))) (VP (VBZ is) (NP (DT a) (JJ dominant) (NN allele))) (. .)))