When you shop with Carolina, you're not alone! All of our products are backed by unparalleled technical support, available from 8:00am to 6:00pm, ET, Monday through Friday. Live chat is available from 8am to 5:30pm ET, Monday-Friday. Contact information (Live Chat, email, and phone) is provided after placing your order at Amazon. From our beginnings in 1927, Carolina Biological Supply Company has grown to become a leading supplier of science teaching materials for all levels of education. Today, from our headquarters in Burlington, North Carolina, we serve customers worldwide, including teachers, professors, homeschool educators, hobbyists, and professionals in health and science-related fields. Product Details A genetic time-saver! Don't have time to carry a cross from the parental generation? We've got you covered. F 1 generation seed will express dominant traits (purple stems, dark green leaves, standard height) and can be used to produce F 2 seed that will show the typical monohybrid (3:1) or dihybrid (9:3:3:1) phenotypic ratios. The result: more genetic concepts learned in less time. F 1 Non-Purple Stem Yellow-Green Leaf is a Fast Plants stock that is heterozygous for 2 genes, produced from a controlled dihybrid cross between Non-Purple Stem, Dark-Green Leaf and Purple-Stem, Yellow-Green Leaf parents ( anl/anl , YGR/YGR x ANL/ANL , ygr/ygr ). In this F 1 (first) generation population, only the dominant phenotypes are expressed, so all have purple stems and dark green leaves. Pack of 200. AP® is a trademark registered and/or owned by the College Board®, which was not involved in the production of, and does not endorse, this product.