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Name________________Period _________ Observing Human Traits CPO 11A Traits are physical characteristics you inherit from your parents. In this investigation, you will take an inventory of your observable traits and compare these to the observable traits of your classmates. Working with a partner, observe which form you have for each trait in the table. Circle your form of each trait in Table 1 (Note: for the final trait, your teacher will give you a piece of PTC paper to taste). Table 1 –Individual Data (circle the form you have for each trait) Trait Earlobe Dimples Chin Hairline Finger Hair Thumb PTC tasting Form 1 Free Present Cleft Widow’s Peak Present Straight thumb Can taste Form 2 Attached Absent No cleft Straight Absent Hitchhiker’s thumb Cannot taste Stop and think 1. For earlobes only, how many students in you class do you think will share the same form (free or attached) as you? Explain your reasoning. How many students? Explanation: 2. Do you think any of your classmates will have the same form of all traits as you? Make a prediction about how many of your classmates will have the same form of all 7 traits as you. Explain your reasoning. How many students? Explanation: Your teacher will display results for the whole class. Enter your results in Table 2 and then use the data to calculate the frequency of each form of the trait for your class. Use this formula: (# of students with form of trait ÷ Total number of students in class) x 100 Table 2 - Class data Trait Number of students with Form 1 Frequency of students with Form 1 Number of students with Form 2 Frequency of students with Form 2 Earlobe Dimples Chin Hairline Finger hair Thumb PTC tasting Analysis: 1. For each trait, which form was most common. Form 1 or 2? Answer using the table at the right. 2. Why do you think one form is more common than the other? Trait Which form was most common? Earlobe Dimples Chin Hairline Finger hair Thumb PTC tasting 3. Do you think you classroom population is typical of a larger population such as your entire school or community? Explain your answer. Is our classroom typical? Explanation: Traits are controlled by factors called genes. For each trait listed in table 1, you get one gene from your mother and one gene from your father. For many traits, there is a dominant form and a recessive form. The dominant gene masks the effect of the recessive gene for the trait. Looking back at the data you collected today, which form of each trait appears to be dominant?