Chromosomal non - disjunction responsible for all except?
Ans. is 'b' i.e., Neurofibromatosis type 1Nondisjunction Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.There are threeforms of nondisjunction: Failure of a pair of homologous chromosomes to separate in meiosisFailure of sister chromatids to separate during meiosis II, andFailure of sister chromatids to separate during mitosis.
Down's syndrome
Neurofibromatsis type 1
Pradderwilli syndrome
Angleman syndrome