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Baby Reebops: Marshmallow Meiosis Originally created by Center for Biology Education @ the University of Wisconsin with a myriad of variations on the web. Purpose: To explore genetic variation in species by constructing baby “Reebops.” Materials: (magic markers, scissors) Antenna= ¼ pipe cleaner Eyes= thumbtacks Humps on back= mini orange or pink marshmallows connected with half toothpicks Nose color= mini green or yellow marshmallows connected with half toothpicks Legs (number)= toothpicks (red or blue) Tail= pipe cleaner Body Segments and Head= large white marshmallows connected with toothpicks Procedure: 1. Divide into groups according to your teacher‟s instructions. 2. Each group will receive one set of each parents chromosomes. . 3. One color of chromosomes is from the mother and the other is from the father. On your answer sheet, designate which chromosomes belong to which parent before you start. (ie. Mother‟s Chromosomes = red, Father‟s Chromosomes = red) 4. A chromosome pair will be the same length. Cut out your chromosomes. Lay the mother‟s chromosome pairs in a row, face down to the left of your lab table. Do the same for the father‟s chromosomes except place them to the right. 5. Pick one chromosome from each of the mother‟s pairs and separate it from the other chromosomes. Place the leftover (unpicked) chromosomes back in the envelope. 6. Do the same for the father‟s chromosomes and place the “unpicked” chromosomes back in the envelope. Place the “picked” chromosomes with the mother‟s chromosomes 7. You should have 7 chromosomes from the mother and 7 from the father. 8. Turn the chromosomes over and match the chromosome pairs (chromosomes of the same length are chromosome pairs). 9. On your answer sheet, write down the 7 gene pairs (genotypes) that were selected. 10. Next write down the phenotypes (physical traits or features) that your baby reebop will have. Use the chart provided to decode your reebop genes. 11. Based on your baby reebop‟s traits, make a „shopping list‟ of the parts you‟ll need to build your baby by filling in the chart on your answer sheet. Be sure you‟ve accounted for the total number of toothpicks you will need!! Once you have checked the list thoroughly, place all of the chromosomes back in the envelope. 12. One person from each group should bring the envelope with ALL of the chromosomes and the shopping list to the Parts Manager (teacher!) to collect your reebop parts. (DO NOT EAT ANY PART OF YOUR CHILD OR POINTS WILL BE DEDUCTED FROM YOUR LAB). 13. Using the list you made and the parts you‟ve collected, construct your baby reebop. Once you‟ve finished, select a name for your baby and write it on a sheet of paper, along with the names of the members in your group. Take your baby reebop and its name tag to your teacher to turn in for a grade. Reebop Genetic Decoder: AA= 2 antenna Aa = 2 antenna aa = no antenna MM = 2 orange back humps QQ = green nose Mm = 1 orange/1pink back humps Qq = green nose mm = 2 pink back humps qq = yellow nose EE = 2 clear eyes Ee = 2 clear eyes ee = 1 clear eyes LL = 4 red legs Ll = 2 red and 2 blue color legs ll = 4 blue legs The color of the parent chromosomes: Mother‟s Chromosomes: red TT = curly tail Tt = wavy tail tt = straight tail DD or Dd = 1 body segment dd = 2 body segments Father‟s Chromosomes: green Chromosome Data for Baby Reebok Allele Pair 1 2 3 4 5 6 7 Phenotype Genotype Part Needed # of Parts Diagram your Baby Reebop below labeling the parts its alleles code for and give him/her a name: 1-8. How do the following terms relate to the activities of this lab? homologous pairgametezygotehaploiddiploidgenetic variationphenotypegenotype- 9. Does your baby have the same GENOTYPE as its parents? YES 10. Does your baby have the same PHENOTYPE as its parents? YES NO NO 11. Name Mendel‟s TWO LAWS that explain why brothers and sisters are not identical even though they come from the same parents? LAW OF ______________________________________ LAW OF ______________________________________________ 12. Which trait(s) in REEBOPS appears to blend and show INCOMPLETE DOMINANCE? ___________________________ 13. Why do you think so? ___________________________________________________________________ ____________________________________________________________________________________ ______________________________________________________________________________________ 14. Which trait(s) in REEBOPS appears to be CODOMINANT? _______________________ 15. Why do you think so? _________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ 16. What does procedure step 5 represent? _____________________________________________________ 17. In procedure step 8, what do chromosome pairs repesent? _____________________________________ 18. What do procedure steps 7-8 represent? ____________________________________________________ 19-20. Assuming the parental cross was as follows: AaQqEeDdMmTtLl X AaQqEeDdMmTtLl a.) What is the possibility of obtaining an aaqqEeddMMTtll offspring? Show your work in determining this. You may either do a punnett square with 16,384 blocks ot do this using the probability rule I taught you. _______________________________________________________________