(a) Failure of homologous chromosomes to segregate during meiosis/ anaphase I/ Meiosis I
(b) (i) Down's syndrome (or Mongolism), Turner's syndrome, Klinefelter's Syndrome.
ii) Albinism, single cell anaemia, haemophilia, colour blindness, chondrodytrophic dwarfism/ Achondroplasia
johnmulu answered the question on May 13, 2017 at 07:12
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