( ( The ( dominant allele ) ) ( ( ( is always ) ( represented ( by ( a ( capital letter ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ dominant) (NN allele)) (VP (VBZ is) (ADVP (RB always)) (VP (VBN represented) (PP (IN by) (NP (DT a) (NN capital) (NN letter))))) (. .)))
The dominant allele is always represented by a capital letter.
(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))) (. .)))