Herediatary Feature

My grandparents eye colours are Brown, Brown & Brown, Blue
My parents eye colour are Brown & Blue/Green
My eye colour is Brown =(

The reason for this is..

The allele for brown eyes is dominant, and the allele for blue eyes is recessive.

The symbol B = brown eye allele and b = blue allele.

There are three possibilities: BB, Bb and bb.

If you inherit either BB or Bb then you will have brown eyes. If you inherit bb you will have blue eyes.

Other genes determine what shade of blue or brown your eyes are.