Predicting Traits

What determines how offsprings look? There are two possible factors for a trait. Each parent, like a coin, haves two factors for a trait. A scientist named Punnett discover a way to predict how will be the outcome of crossing two different forms of a trait. This method was named Punnett square. There are other methods such as pedigree that are used to trace the history of traits in a family. In pedigrees some individuals are called carriers. A carrier has inherited a factor for a trait but does not show it.