1. The alleles for tallness can be homozygous or heterozygous as TT or Tt
2. During gametes formation the genes separate independently
3. Genes of gametes combine randomly during fertilization
4. A gamete carries only one member of the alleles T or t
5. During fertilization T may combine with t to form a zygote, Tt for tallness since T for tallness is dominant over t for shortness.