( ( Heterozygous ( Having ( ( two ( different alleles ) ) ( of ( the ( same gene ) ) ) ) ) ) . )
(ROOT (NP (NP (NNS Heterozygous)) (VP (VBG Having) (NP (NP (CD two) (JJ different) (NNS alleles)) (PP (IN of) (NP (DT the) (JJ same) (NN gene))))) (. .)))
Heterozygous Having two different alleles of the same gene .
(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))) (. .)))