( ( Sometimes ( during ( ( the course ) ( of ( normal meiosis ) ) ) ) ) ( , ( chromosomes ( ( ( ( are not ) correctly ) ( ( distributed ( from ( a ( dividing cell ) ) ) ) ( into ( the ( two ( daughter cells ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (ADVP (RB Sometimes)) (IN during) (NP (NP (DT the) (NN course)) (PP (IN of) (NP (JJ normal) (NNS meiosis))))) (, ,) (NP (NNS chromosomes)) (VP (VBP are) (RB not) (ADVP (RB correctly)) (VP (VBN distributed) (PP (IN from) (NP (DT a) (JJ dividing) (NN cell))) (PP (IN into) (NP (DT the) (CD two) (NN daughter) (NNS cells))))) (. .)))
Sometimes during the course of normal meiosis, chromosomes are not correctly distributed from a dividing cell into the two daughter cells.
(ROOT (S (NP (NNP Daughter) (NNS cells)) (VP (VBP divide) (PP (IN by) (NP (NNS meiosis)))) (. .)))