One of the following was not postulated by Mendel.

• A

  When two pairs of traits are combined in a hybrid segregation of one pair of traits is independent of another pair of traits. 

• B

  Characters are controlled by discrete units called factors.

• C

  In a dissimilar pair of factors one member of the pair dominates the other.

• D

  Factors for two different characters can be present on the same chromosome and inherited together.