Genetics with a SMILE!! Part A: Name: __________________________________ Smiley Face Traits Obtain two coins from your teacher. Mark one coin with an “F” and the other with an “M” to represent each of the parents for your Smiley. The parents are heterozygous for all of the Smiley Face traits (except for blood type). Flip the coins for each trait to determine which alleles get passed onto the offspring. The columns are labeled for ‘Heads up’ and ‘Tails up’. Write the letter for each allele from the coin toss in the ‘Genotype’ column to form your Smiley’s genotype. Use the ‘Smiley Face Traits’ page to determine the phenotype for your Smiley. Female Male Trait Heads up Tails up Heads up Tails up Face shape C c C c Eye shape E e E e Hair style S s S s Smile T t T t Ear style V v V v Nose style D d D d Face color Y y Y y Eye color B b B b Hair length HL HS HL HS Freckles F f F f Nose color R Y R Y Ear color P T P T Gender X X X Y Blood type IA i IB i Color-blindness XN Xn Xn Y Genotype Phenotype Part B: Create your Smiley! Use the ‘Smiley Face Traits’ page and your results from Part A to create a sketch of your Smiley in the box to the right. Once you have completed the sketch, use the drawing tools in Microsoft Word or Paint to create your Smiley! On your finished document, be sure to give your Smiley a name and include your name and class period as well. DO NOT PRINT until you are given the OK from your teacher. Part C: Analyzing Results Answer the following questions about your Smiley in the space provided. Be sure that your answers are complete and fully answer the question that is being asked. 1. Overall, does your Smiley have more dominant traits or recessive traits expressed? 2. Which trait(s) is a result of codominance? How is this expressed in a heterozygous offspring (phenotype)? 3. Which trait(s) is a result of incomplete dominance? How is this expressed in a heterozygous offspring (phenotype)? 4. Which trait(s) is a result of multiple alleles? What kind of interaction is there between the multiple alleles (dominant/recessive, codominance, incomplete, etc.)? 5. Which trait(s) is a result of a sex-linked gene? How do you know? 6. How would your Smiley change if ONE of the parents were homozygous dominant for all the traits while the other was heterozygous? 7. Uncle Smiley, who is heterozygous for a yellow face, married a woman with a green face. Both of them have always wanted a large family! If they were to have 12 children, what is the probability that the children would have yellow faces? What is the probability they would have green faces? Create a Punnett square to help show your answers. 8. Grandmas and Grandpa Smiley are heterozygous for the star eye shape. If one of their homozygous children married a girl with blast-type eyes, what percentage of their grandchildren might have starry eyes? What percentage might have blast-type eyes? Create a Punnett square to help show your answers. 9. Baby Smiley has curly hair, but neither of her parents do!! Is this possible? Create a Punnett square to help show your answers. 10. Both Aunt and Uncle Smiley have Type B blood. Is it possible for them to have a baby Smiley with Type O blood? Is it possible for them to have a baby Smiley with Type A or Type AB blood? Create a Punnett square to help show your answers. Part D: Extension What if we wanted to look at the probability of getting an offspring with TWO specific traits!! We can still create a Punnett square to show the possible outcomes, but it would require more boxes. First, we have to find all the possible TWO allele combinations for each parent and then create a row/column for each. If we are dealing with TWO traits, we could need 16 boxes! The probability is still expressed the same (as ____ out of _____) and a percent can then be calculated. Use the information below to complete the Punnett square for TWO traits and answer the questions that follow. Mr. Smiley is heterozygous for both nose style (Dd) and freckles (Ff). So is Mrs. Smiley! Mr. Smiley – DdFf Mrs. Smiley - DdFf DF DF Df dF df DDFF Complete the Punnett square as you normally would, just be sure to place the same letters Df DdFf next to one another. A few examples have been completed for you. dF df ddFf Ddff What is the probability of producing a baby Smiley with the following traits: a) a down nose and freckles - ________ out of a possible __________ OR ______________ % b) a down nose and NO freckles - ________ out of a possible __________ OR ______________ % c) an up nose and freckles - ________ out of a possible __________ OR ______________ % d) an up nose and NO freckles - ________ out of a possible __________ OR ______________ % Smiley Face Traits Face Shape Circle (C) Nose Style Square (c) Down (D) Up (d) Eye Shape Star (E) Blast (e) Hair Style Straight (S) Curly (s) Smile Thick (T) Thin (t) Ear Style Curved (V) Pointed (v) Face Color Yellow (Y) Green (y) Eye Color Blue (B) Red (b) Hair Length Long (HL) Short (HS) BOTH long/short (HLHS) Nose Color Red (R) Yellow (Y) Orange (RY) Freckles Present (F) Absent (f) Ear Color Hot Pink (P) Teal (T) Purple (PT) Gender Female (XX) – pink bow in hair Male (XY) – blue bow in hair Color Blindness Normal vision (N) – NO glasses Colorblind (n) – ADD glasses Blood Type Type A (IA) Type B (IB) Type O (i)