A biologist marked a cell that he knew was about to undergo meiosis. A short time later he observed the four cells produced by t
he original marked cell, their chromosome numbers were 17, 17, 18, 16. He knew these numbers indicate that something abnormal had occurred during meiosis.
NON DISJUNCTION: when 2 homologous chromosomes move to the same pole during meiosis. One daughter cell will be missing one chromosome while the other will have an extra chromosome.
