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Instructor’s Copy Lab Worksheet: I Like Your Genes Use the diagrams provided by your teacher to help you complete the following data table. Data varies by class. Trait Dominant Recessive Possible genotypes Class dominant Class recessive PTC taster Tongue roller Ear lobes Dimples Freckles Hair whorl Widow’s peak Handedness Finger length Eye color Nearsightedness Hair color Hitchhiker’s thumb Folding hands Little finger Eyelashes Darwin’s ear point Hairy joint QUESTIONS: 1. Did you show more dominant or recessive traits? Individual answer, make sure it is backed up by the student’s data. 2. Did your class show more dominant or recessive traits? Varies, make sure it is backed up by the student’s data. 3. If you show the dominant trait, is it possible for you to determine your exact genotype? No 4. Explain your answer to number 3. Can’t tell if you are homozygous dominant (AA) or heterozygous (Aa) 5. If you show the recessive trait, is it possible for you to determine your exact genotype? Yes 6. Explain your answer to number 5. Have to be aa, this is the only way a recessive trait shows up. 7. Is it possible for you to show a trait that is present in your grandparents even if your parents do not show the trait? Yes 8. Explain your answer to number 7. It could be carried recessively in your parents, and both recessives matched up in you so the trait was expressed. 9. If more males than females show a trait, it may be because the trait is passed on the X chromosome. What is the name for this type of trait? Sex-linked trait. 10. Some scientists are trying to show that a person’s ability to taste PTC paper may determine why those same people don’t like certain types of food like brussel sprouts. How is this possible? Whether dominant or recessive, if the gene is present, it would make you taste something nasty where someone without the trait would not taste it.