In your paper model, simulate the process of crossing over in the two parents by cutting or tearing the chromatids to swap genes. Be sure to swap the same type of gene. For example, the allele for trait 1 should swap places only with the other allele for trait 1 of the chromatids of the homologous chromosome. Tape your new chromatids together. Now separate out the four single, crossed-over chromosomes to model four haploid cells from each parent. Next, make at least four genetic matches of offspring by moving a chromosome from a sperm and egg cell together to form a diploid offspring. In the table, record the genotype and phenotype of each offspring as shown in the example.