A Punnett squares is a handy tool to predict expected progeny outcomes from a specific mating. A Punnett square only works with simply inherited traits (where one or just a few genes control the phenotype i.e., coat color, horned/polled, and many of the genetic conditions) but traits with multiple genes get too cumbersome. To use a Punnett square, you should know the genes involved with the trait, the genotypes of the parents, and whether certain alleles (variations of the same gene) are dominant, recessive, or somewhere in between. For more information including tips and examples of using Punnett squares, see ASA’s Have you herd? http://haveuherd.wordpress.com/2014/03/24/a-punnett-square-a-tool-to-help-manage-simple-genetic-traits/ or visit the tREG blog story http://wp.me/p3V2LM-5Z.