Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Human genetic variation wikipedia , lookup
Population genetics wikipedia , lookup
Genetically modified crops wikipedia , lookup
Dominance (genetics) wikipedia , lookup
Behavioural genetics wikipedia , lookup
Dual inheritance theory wikipedia , lookup
Heritability of IQ wikipedia , lookup
B7 Quick Lab Genetic Variation in the Classroom Everyone has a distinct set of traits. Some of these traits are hereditary. In this activity, you will examine your own features to see what traits you have. You will also calculate the frequency of particular traits in the classroom population. Purpose To observe various hereditary traits and calculate the frequency of traits in the classroom population Materials & Equipment • • • mirror pencil or pen paper Procedure 1. Obtain or make a copy of Table B7.1, a data table for your genetic trait survey. 2. Predict if you think the traits listed in the table will be distributed evenly among the class, or if dominant traits will show up more often than recessive traits. 3. Examine your features for each category of trait. Determine which traits you have. 4. Your teacher will survey the class as a group to find out which traits everyone has. Record the totals in your data table. Questions 5. Calculate the frequency of each trait in the classroom population. Multiply each frequency by 100 in order to calculate the percentage of each trait. Record your calculations and the results in your table. Number of students with trait 100 _____% Number of students in class 6. How do the results compare to your initial predictions? 7. For any category of trait, was the recessive trait more common than the dominant trait? If so, hypothesize why this might be the case. 8. Did anyone have traits that were difficult to categorize as dominant or recessive? Explain. 9. Did any two or more people in the class have the same set of traits expressed in exactly the same way? Explain. 9780137053612 Copyright © 2011 Pearson Canada Inc. This page may have been modified from its original. BiologySource 11 Table B7.1 Genetic Trait Survey Category Dominant Trait Number Percentage Recessive Trait Hair curliness Naturally curly hair Naturally straight hair Cheek dimples Dimples on one or both sides of the face No dimples on either cheek Chin shape Cleft in chin No cleft in chin Earlobes Earlobes hang free Earlobes directly attach to side of head Freckles Freckles present Freckles absent Pointed hairline (widow’s peak) Hairline forms a point Straight hairline Thumb bending Can bend thumb forward or backward Cannot bend thumb forward or backward Number Percentage (Art/ArtPlus Limited) BiologySource 11 Copyright © 2011 Pearson Canada Inc. 9780137053612 This page may have been modified from its original.