( ( If ( ( the ( two alleles ) ) differ ) ) ( , ( one ( ( ( is fully ) ( expressed ( -LRB- ( ( dominant allele ) -RRB- ) ) ) ) ; ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (CD two) (NNS alleles)) (VP (VBP differ)))) (, ,) (NP (PRP one)) (VP (VBZ is) (ADVP (RB fully)) (VP (VBN expressed) (PRN (-LRB- -LRB-) (NP (JJ dominant) (NN allele)) (-RRB- -RRB-)))) (: ;)))
If the two alleles differ, one is fully expressed (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))) (. .)))