Mendelian concepts of heredity:

   a)      Concept of Unit character:

 ð  Factors responsible for expression of characters are called unit characters or alleles.

   b)      Concept of purity of gametes:

 ð  It suggests a gamete carries only one gene which regards to one character

   c)       Concept of dominance:

 ð  The traits which appear in F1 generation are dominant and the traits which don’t appear in F1 generation are recessive, when two pure bred plants are cross pollinated.

   d)      Law of segregation:

 ð  In a cross involving a single character, the factors responsible for the two contrasting traits stay together in F1 generation but segregate during the formation of gametes.

   e)      Law of independent assortment:

 ð  In a di hybrid cross where two contrasting characters are brought together, factors responsible for 2 pairs of contrasting characters stay in F1 generation but assort independently in during the formation of gametes.