( ( ( ( ( Generally , ) but ) not ) always ) ( ( a ( dominant allele ) ) . ) )
(ROOT (FRAG (ADVP (ADVP (RB Generally)) (, ,) (CC but) (RB not) (ADVP (RB always))) (NP (DT a) (JJ dominant) (NN allele)) (. .)))
Generally, but not always a dominant allele.
(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))) (. .)))