Meiosis I is reductional division and Meiosis II is equational division because of
  1. separation of homologous chromosome 
  2. crossing over
  3. disjunction of homologous chromosome
  4. pairing of homologous chromosome

Dear student,
Option 4 is correct.
Pairing of homologous chromosome is the reason why meiosis-I  is known as reduction division.


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