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Experimental Design Diagram

Experimental Design Diagram. Title: The Effect of Genotypes on Human Facial Features Hypothesis: If genotypes are different, then facial features will….. Independent Variable: Different Genotypes Levels of Independent Variable

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Experimental Design Diagram

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  1. Experimental Design Diagram Title: The Effect of Genotypes on Human Facial Features Hypothesis: If genotypes are different, then facial features will….. Independent Variable: Different Genotypes Levels of Independent Variable Homozygous dominant Heterozygous Homozygous recessive # of Repeated Trials (Number of students in class) Control: N/A Dependent Variable: Number of dominant and recessive phenotypes Constants: Pennies, Number of coin flips, Facial features

  2. Materials Needed: 1. Penny 2. Facial Feature Reference Sheet 3. Data Sheet 4. Colored Pencils 5. Drawing Paper Procedure Outline: 1. Flip the penny to determine the gender of the face: heads = female, tails = males. Record on data sheet. 2. (From now on coin flips will represent dominant and recessive genes.) Flip the coin twice for each facial trait (once for the maternal gene and once for the paternal gene). 3. If heads is flipped, record the capital letter indicted for that trait on the reference sheet in your data table. 4. If tails is flipped, record the lower case letter. 5. If the trait is polygenic (more than one letter), flip twice for each letter indicated (see hair color and eye color). 6. In the genotype column, put the maternal and paternal “alleles” together. Always put the capital letter first. 7. Fill in the phenotype column by using the information on the reference sheet. 8. When all traits have been determined, use the reference sheet to draw and color the face. Make the face the size of the paper. (Extra credit will be given to add a small body with a creative outfit.) 9.Use the data to write a lab report about the impact of dominant and recessive genotypes on phenotypes of the human face.

  3. Conclusion: • Summarize the data and state whether or not it supports your hypothesis. • Explain why you think it turned out the way it did. • Explain some way that this data could be useful to someone? • Give an example of another experiment we could do to show how speciation occurs. • What could we have done to improve on this activity?

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