【MEDICAL SCIENCE ANATOMY CHROMOSOMAL CHANGE MODEL】The model shows the behavioral changes of homologous chromosomes and their associations, crossover, homologous chromosomes, sister chromatid separation, etc. during meiosis. It is suitable for middle school biology teaching and serves as a visual aid when teaching relevant courses. 【TEACHING TOOLS】Cell Meiosis Model the colors are bright and easy to attract students' attention, so you can to teaching demonstration, which promotes students' understanding and increases classroom fu 【MATERIAL & SIZEIt made of food-grade PVC environmentally friendly materials, high quality prototype,Handmade in a solid, non-broken. Product size :Panel size: length 280mm, width 180mm, thickness 15mm. Large chromosome length: 7.3cm, small chromosome length: 4.1cm. 【LAB SUPPLIES】PVC material does not have to worry about being broken by students,so It will be a great addition to your lab supplies. Great for school teaching tool, learning display, and collectibles. 【PRACTICE TOOL】The anatomical is very standard, can help students to carry out comprehensive teaching practice.