( And ( ( in fact ) ( , ( ( human ( controlled evolution ) ) ( ( may ( ( accelerate ( to ( the point ) ) ) ( where ( there ( ( ( ( ( ( will ( be ( ( ( ( at least ) two ) varieties ) ( of ( Homo sapiens ) ) ) ) ) , ) ( ( so distinct ) ( in ( their genomes ) ) ) ) ( that ( they ( will ( ( be actually ) ( different species ) ) ) ) ) ) and ) ( ( will ( no longer ) ) ( be ( able ( to ( ( ( mate and ) produce ) ( fertile offspring ) ) ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (CC And) (PP (IN in) (NP (NN fact))) (, ,) (NP (JJ human) (JJ controlled) (NN evolution)) (VP (MD may) (VP (VB accelerate) (PP (TO to) (NP (DT the) (NN point))) (SBAR (WHADVP (WRB where)) (S (NP (EX there)) (VP (VP (VP (MD will) (VP (VB be) (NP (NP (QP (IN at) (JJS least) (CD two)) (NNS varieties)) (PP (IN of) (NP (NN Homo) (NNS sapiens)))))) (, ,) (VP (ADJP (RB so) (JJ distinct)) (PP (IN in) (NP (PRP$ their) (NNS genomes)))) (SBAR (IN that) (S (NP (PRP they)) (VP (MD will) (VP (VB be) (ADVP (RB actually)) (NP (JJ different) (NNS species))))))) (CC and) (VP (MD will) (ADVP (RB no) (RB longer)) (VP (VB be) (ADJP (JJ able) (S (VP (TO to) (VP (VB mate) (CC and) (VB produce) (NP (ADJP (JJ fertile)) (NN offspring))))))))))))) (. .)))
And in fact, human controlled evolution may accelerate to the point where there will be at least two varieties of Homo sapiens, so distinct in their genomes that they will be actually different species and will no longer be able to mate and produce fertile offspring.
(ROOT (S (SBAR (IN If) (S (NP (CD two) (NNS populations)) (VP (VBP do) (RB not) (VP (VB mate) (CC and) (VB produce) (NP (ADJP (JJ fertile)) (NN offspring)))))) (, ,) (NP (JJ separate) (NNS species)) (VP (VBP result)) (. .)))