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Name ______________________ Reebop Lab In this lab you will discover the link between meiosis and the work of Mendel in genetics. You will be working with an organism called a reebop. Chromosomal analysis has revealed that reebops have seven homologous pairs, or 14 total chromosomes. You will work in pairs and be given two complete sets of genetic information for an individual reebop (mom and dad). You will demonstrate Mendel’s law of independent assortment as you randomly choose seven alleles which appear in the gamete (haploid) you will contribute to the offspring. Once you and your partner combined genetic information from two gametes, you will analyze your genotypes and build you reebop baby based upon the resulting phenotypes. Procedure: 1. Assemble in pairs 2. Each pair will receive a male and female envelope which contains a complete set of genetic information made up of seven homologous pairs of chromosomes. 3. Each member of the pair should randomly choose one chromosome from each pair. In order to do this, place each chromosome face down so you can not see the written allele. Randomly choose one chromosome (allele) from each homologous pair. You should now have a gamete composed of seven chromosomes. 4. Pair your seven chromosomes with your partner’s--you should now have 7 homologous pairs of chromosomes, 14 total chromosomes, 7 pink and 7 blue. 5. Record your reebop’s genotypes for each of the seven possible traits in data table 1 and then use table two to find the corresponding phenotypes for each trait. 6. Build your reebop according to the appropriate phenotypes. 7. Draw your reebop in color at the bottom of your data page. Data Page Purpose: _______________________________________________________ _________________________________________________________________ Data Table Chromosome Genotype Phenotype Number ________________________________________________________________ 1 2 3 4 5 6 7 ________________________________________________________________ Reebop Decoder Key 2 antenna = AA or Aa No antenna = aa (straight pins) 1 green hump = MM 2 green humps = Mm 3 green humps = mm (small marshmallows) Red nose = QQ Orange nose = Qq Yellow nose = qq (small marshmallows) Reebop Drawing 2 eyes = EE or Ee 3 eyes = ee (push pins) Green legs = LL or Ll Yellow legs = ll 2 body segments = dd 3 body segments = DD or Dd (large marshmallows) Curly tail = TT or Tt Straight tail = tt (pipe cleaner) Address the following analysis questions by completely explaining in the spaces provided. 1. Explain what is meant by dominance and recessiveness. Specfically point out where complete dominance and recessiveness was displayed. 2. Explain what is meant by incomplete dominance. Specifically, point out the phenotypes in the Reebops where incomplete dominance was displayed and explain why they were a demonstration of incomplete dominance. 3. The Principle of Segregation states that the members of each pair of genes separate when gametes are formed. At what point in the activity did you perform the Law of Segregation. 4. The Principle of Independent Assortment means that genes (alleles that are located on separate chromosomes) are inherited separately from one another. Specifically point out how you “obeyed” this principle in the reebop activity.