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Bunny Babies Objective: Students use their knowledge of how traits are inherited to determine the traits for Easter Egg Bunnies. Background: At fertilization the genetic traits of an individual are determined. Fertilization occurs when two gametes, an egg and a sperm, join together. Each of the cells contributes a set of traits to the offspring. In this activity you will use coins to represent the egg and sperm. The parents are heterozygous for each of the possible traits for our bunny baby. You will flip the coins to determine which trait your bunny baby will inherit. You will then build a model of your bunny baby. Plastic Glue Construction Glue paper sticks Materials: egg gun Two Sharpie Scissors coins Marker Colored Pencils White Paper Procedure: 1. Decide which coin will represent the Female gamete and which coin will represent the Male gamete. 2. For each of the following traits, flip each coin one time. Record "H" for heads and "h" for tails. This will determine the genotype of your Bunny Baby. 3. Obtain a Trait Sheet from your teacher. Record the Phenotype for each of the traits on your Trait Sheet. 4. Use your phenotypes to put together the model of your Bunny Baby. (Alternative: Draw your baby bunny with colored pencils) Record your Bunny Baby genotype and phenotype on this chart. Trait Head Shape Ear Color Ear Shape Ear Size Eye Color Nose Shape Mouth Shape Whiskers Sex (only flip male coin) Female Male Phenotype Bunny Baby Phenotypes Trait Head Shape Ear Color HH Hh hh Pointed Pointed Pointed end of egg end of egg end of egg down down up Green Red Yellow Ear Shape Ears pointed at the top Ears pointed at the top Ears rounded at the top Ear Size Long(5 cm or more) Medium Short (less (more than 3 cm) than 3 and less than 5 cm) Brown Blue Pink Nose Shape Upside down triangle Upside down triangle oval on side Mouth Shape Smile Smile Frown Whiskers Straight Straight curly Sex Male, Bow Tie Eye Color Female, Hair Bow Conclusion Questions: 1. Which of the traits are results of dominant and recessive genes? 2. Which of the traits are results of incomplete dominance? 3. Use the class results and determine the ratio of male to female babies. 4. Did our class results show the predicted outcome from a Punnett Square? Explain why or why not. 5. Use the class results and determine the ratio of pointed ears to rounded ears. 6. Did our results show the predicted outcome from a Punnett Square? Explain why or why not.