1 Hold one Popsicle stick in each hand about 6 inches above the desk Hold each

1 hold one popsicle stick in each hand about 6 inches

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1. Hold one Popsicle stick in each hand about 6 inches above the desk. Hold each Popsicle stick horizontally with one side facing toward you and the other facing away (with one edge of the Popsicle stick on the bottom and the other edge on the top). The two Popsicle sticks should be lined up end-to-end, simulating the way pairs of homologous chromosomes line up in the center of the cell during the first meiotic division. Simultaneously drop both Popsicle sticks on the desk. The side of each Popsicle stick that is up represents the chromosome that is contained in the egg. This indicates which alleles are passed on to the baby dragon. Put a I in the appropriate box in the chart below to record the genotype of the resulting baby dragon. Mother ( WwHh ) wh wH Wh WH Father ( wwhh ) wh Genotype of baby = wwhh Number of babies with this genotype =____ Genotype of baby = wwHh Number of babies with this genotype =____ Genotype of baby = Wwhh Number of babies with this genotype =____ Genotype of baby = WwHh Number of babies with this genotype =____ 2. Repeat step 1 three times to make and record three more baby dragons. 2 For the purposes of this activity, we will ignore the sister chromatids of each chromosome, since they are not relevant for understanding the genetics discussed in this activity. Also, we assume that both of the chromosomes under investigation are autosomes. 4
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Summary and Interpretation of Data 1. Compile the data for all the baby dragons produced by all the students in the following chart.Mother (WwHh)whwHWhWHFather(wwhh)whGenotype of baby =________Number of babies with this genotype =___Phenotype:Wings __ or no wings __Horns big __ or small __Genotype of baby =________Number of babies with this genotype =___Phenotype:Wings __ or no wings __Horns big __ or small __Genotype of baby =________Number of babies with this genotype =___Phenotype:Wings __ or no wings __Horns big __ or small __Genotype of baby =________Number of babies with this genotype =___Phenotype:Wings __ or no wings __Horns big __ or small __2. Do any of the baby dragons with wings have small horns?Does either parent have the combination of wings and small horns? (See page 1.)How did this new combination of characteristics (wings and small horns) arise in some of the baby dragons? (Your answer will include events during meiosis and fertilization, so youmay find it helpful to review the diagram of meiosis on page 2 and the chart of fertilization on page 3.)3. On page 3 you used your understanding of meiosis and fertilization to predict whether baby dragons with wings and without wings would be equally likely to have big horns. What was your prediction?Use the class results shown above to complete the following table.Fraction that have big hornsBaby dragons with wingsBaby dragons without wingsResultsDo your results match your prediction? 5
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  • Winter '16
  • Matthew Van Kouwenberg

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