( ( Because ( ( many ( early geneticists ) ) ( believed ( that ( there ( ( were ( ( only ( two ( possible alternatives ) ) ) ( for ( a gene ) ) ) ) ( ( ( ( `` ( good ( '' alleles ) ) ) ( that ( functioned normally ) ) ) and ) ( ( `` ( bad ( '' alleles ) ) ) ( that ( did n't ) ) ) ) ) ) ) ) ) ) ( they ( ( expected ( to ( ( find ( little ( genetic variability ) ) ) ( in ( a population ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (JJ many) (JJ early) (NNS geneticists)) (VP (VBD believed) (SBAR (IN that) (S (NP (EX there)) (VP (VBD were) (ADVP (RB only) (NP (CD two) (JJ possible) (NNS alternatives)) (PP (IN for) (NP (DT a) (NN gene)))) (NP (NP (NP (`` ``) (JJ good) ('' '') (NNS alleles)) (SBAR (WHNP (WDT that)) (S (VP (VBD functioned) (ADVP (RB normally)))))) (CC and) (NP (NP (`` ``) (JJ bad) ('' '') (NNS alleles)) (SBAR (WHNP (WDT that)) (S (VP (VBD did) (RB n't)))))))))))) (NP (PRP they)) (VP (VBD expected) (S (VP (TO to) (VP (VB find) (NP (JJ little) (JJ genetic) (NN variability)) (PP (IN in) (NP (DT a) (NN population))))))) (. .)))
Because many early geneticists believed that there were only two possible alternatives for a gene &quot;good&quot; alleles that functioned normally and &quot;bad&quot; alleles that didn't they expected to find little genetic variability in a population.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (JJ human) (NNS genes)))) (VP (VBP have) (NP (QP (CD two) (CC or) (JJR more)) (JJ possible) (NNS alleles))) (. .)))