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Name: _________________________________ Date: __________________ Class: _______ DATA, OBSERVATIONS AND ANALYSIS FOR THE PTC LAB: Determination of Genotypes from Phenotypes in Humans 1. Fill in the boxes marked with a + in the column below by looking at the dominant and recessive traits to figure out what the phenotypes of the heterozygous individuals would be. Use the information at the beginning of this packet to help you. 2. Fill in the boxes marked with a * in the table below by looking at your OWN phenotypes (or have a partner look for you). Completely Dominant Human Phenotypes and Genotypes Gene Dominant Phenotype PTC taste Taster Hairline Widow’s peak Eye shape Almond Eyelash length Long Tongue Dexterity Can roll Thumb type Hitchhiker’s thumb Lip thickness Thick Pure Dominant Genotype(s) + + + + + + + Heterozygous Phenotype Taster Widow’s peak Almond Long Can roll Hitchhiker’s thumb Thick Heterozygous Genotype (s) + + + + + + + Recessive Phenotype Nontaster Straight hairline Round Short Can’t roll Straight thumb Thin + * Your Possible Genotypes (list all) * + * * + * * + * * + * * + * * + * * Recessive Genotype (s) Your Phenotype 3. Fill in the boxes marked with a * in the table below by looking at your OWN phenotypes (or have a partner look for you). Incompletely Dominant Human Phenotypes and Genotypes Gene Homozygous Phenotype Hair texture Curly Inter-eye distance Close together Lip protrusion Protruding Homozygous Genotype + Heterozygous Phenotype Wavy Heterozygous Genotype + + Medium distance + + Slightly protruding + Homozygous Phenotype Straight Far apart Not protruding Homozygous Genotype Your Possible Genotypes Your Phenotype + * * + * * + * * 4. Using a colored pencil so that I can still read your genotypes and phenotypes, shade each box under “YOUR PHENOTYPE” and “YOUR POSSIBLE GENOTYPES” according to the following information: a. For the traits governed by complete dominance…. i. Shade in the traits for which you have a dominant phenotype RED. ii. Shade in the traits for which you have a recessive phenotype BLUE. b. For the traits governed by incomplete dominance…. i. Shade in the traits for which you are homozygous GREEN. ii. Shade in the traits for which you are blended phenotype PURPLE. 5. Look at the traits that are governed by complete dominance for which you have a dominant phenotype. What could you do to tell if your genotype was homozygous or heterozygous? 6. Why was untreated PTC paper used in the PTC taste test?
