If you are like me, you are covering Genetics around Valentine's Day. This activity is perfect for reinforcing genetic principles such as Genotype, Phenotype, Complete Dominance, Incomplete Dominance, Codominance, and much, much more. Students pair female chromosomes from an "egg" and male chromosomes from a "sperm" to determine the genotype of 11 different traits for their valentine. They use these genotypes to determine the phenotypes of their particular valentine. From here, students use the included parts to assemble their valentine according to the phenotypes. Everything you need is included in this activity: Female chromosomes, male chromosomes, Valentine parts, Student lab sheet, Teacher directions, and answer key. You will only need to supply colored pencils, glue, scissors, and students!! I have included enough chromosomes so that you can vary the type of valentine each group will get. Students can quickly see which traits are dominant & recessive.