.Definition-some traits are determined by the combined effects of more than one pair of genes.
.In the above image of a punnet square it shoes the different possibility of eye color. You can see that brown eyes are more common than green, and green is more common than blue. This shows that blue and green are recessive traits and brown eyes are dominate traits.
.In the below image, you can see an example of hair color.
.Parents pass down these genes to their kids, wich in turn give their traits to their kids and on down the line.
.A trait is carried on down the line only if it has a dominate gene in it like: Dd the capitol D dominate so it will carry on down the line.
.All of the following are traits : tongue rolling, cleft chin, and earlobe attachment.