( Allele - )
(ROOT (NP (NNP Allele) (: -)))
Allele -
(ROOT (S (NP (NNP Allele)) (ADVP (RB frequecy)) (VP (VBZ is) (NP (NP (DT the) (NN rate)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (DT a) (JJ specific) (NN allele)) (VP (VBZ appears) (PP (IN within) (NP (DT a) (NN population)))))))) (. .)))