Reebops Revised

Name _________________________________ Due Date _____________ Per. _________ Let’s Make A Reebop Baby Question: How can inheritance be studied by observing traits in parents and their offspring? Hypothesis: (If… then… statement; this should be a prediction of how you can answer the question above.) If we cross two reebop parents, then in their offspring we will see - Objective: A new species has been discovered called Reebops. Using your knowledge of genetics you will: identify the Reebop traits as classic dominance, incomplete dominance, or co-dominance; create Punnett squares to predict the possible outcomes for each Reebop trait based on the parents’ genotypes; create a pedigree to follow the inheritance pattern for each trait. Materials: Reebop Traits Sheet Large White Marshmallows Toothpicks (plain and colored) Colored Markers Small White Marshmallows Small Colored Marshmallows Pipe Cleaners Coin Dice Parent Genotypes Sheet Procedure: 1. Each student will be given a genotype of their Reebop parent and a traits sheet. 2. Students will work with a partner to cross their parent Reebops to make a baby Reebop. 3. Using each parent Reebop’s genotype, create Punnett squares for the traits. 4. Determine if each trait is an example of classic dominance, incomplete dominance, or co-dominance 5. After creating the Punnett squares, roll the die to determine the genotype of the Reebop baby for EACH Punnett square. Whatever number you land on each time, circle the genotype in that numbered square and record the genotype in the data chart. Do this again for each Punnett square. 6. You and your partner will work together to assemble your Reebop baby using the genotype determined in step 5 and the Reebop Trait Sheet. Look at the “offspring phenotype” column that you filled out to know exactly what it should look like. Data: Determine its sex by flipping a coin. Heads = female baby Reebop, Tails = male baby Reebop Write the sex of your baby Reebop here: _________________________________ Trait Parent #1 Genotype Parent #2 Genotype Offspring Genotype Offspring Phenotype 1. Bumps on back 2. Nose Color 3. Body Segments 4. Tail Shape After you create the baby Reebop, get your teacher to initial here:______ 5. Pairs of Legs 6. Color of Antennae 7. Number of Eyes 8. Eye Color Now, use the Parent #1 and Parent #2 genotypes to complete all eight Punnett squares so you can find the offspring genotype! Notation reminder: Probability should be written as a fraction (1/4), percentage (25%) or decimal (0.25) Genotype ratios should be written using the genotype letters. Example: 1HH:2Hh:1hh 1. Trait: Bumps on Back 2. Trait: Nose Color Type of Dominance: classic/incomplete/codominance Type of Dominance: classic/incomplete/codominance Probability of 2 Bumps: Probability of 3 Bumps: Genotypic Ratio: 1 2 3 4 Probability of Red nose: Probability of Purple nose: Probability of Blue nose: Genotypic Ratio: 1 2 3 4 3. Trait: Body Segments Type of Dominance: classic/incomplete/codominance Probability of 2 body segments: Probability of 3 body segments: Genotypic Ratio: 4. Trait: Tail Shape Type of Dominance: classic/incomplete/codominance 1 2 3 4 Probability of Curly Tail: Probability of Straight Tail: Genotypic Ratio: 1 2 3 4 5. Trait: Pairs of Legs 6. Trait: Color of Antennae Type of Dominance: classic/incomplete/codominance Type of Dominance: classic/incomplete/codominance Probability of 2 Pairs of Legs: Probability of 3 Pairs of Legs: Genotypic Ratio: Probability of Blue antennae: Probability of Green antennae: Probability of Yellow antennae: Genotypic Ratio: 1 2 3 4 1 2 3 4 7. Trait: Number of Eyes 8. Trait: Eye Color Type of Dominance: classic/incomplete/codominance Type of Dominance: classic/incomplete/codominance Probability of 2 Eyes: Probability of 3 Eyes: Genotypic Ratio: 1 2 3 4 Probability of Black Eyes: Probability of Red and Black Eyes: Probability of Red Eyes: Genotypic Ratio: 1 2 3 4 Analysis Questions: ANSWER THESE USING COMPLETE SENTENCES AND SHOW YOUR WORK!! 1. Which trait is dominant in Reebops, straight tail or curly tail? Explain how you know. 2. Look at the offspring of at least 4 other pairs, what are all the variations in traits you observe in the other Reebop babies? List at least 4 differences: 1) 2) 3) 4) 3. Does your Reebop look exactly like either of its parents? _________________ Which traits does it have in common with its parents and which traits are completely different? 4. If two Reebop parents with curly tails produced offspring and some have curly tails and some have straight tails, what are the genotypes of the parents? Show the Punnett square to prove your answer. Be sure to write out both parent genotypes. 5. If a purple nosed Reebop is crossed with a blue nosed Reebop, what are all the nose colors their offspring could have? Show the Punnett square to prove your answer. 6. Two Reebops, each having 2 pairs of legs and purple noses are crossed. They produce offspring with the following phenotypes: Offspring 1: 2 pairs of legs, purple nose Offspring 2: 3 pairs of legs, purple nose Offspring 3: 2 pairs of legs, red nose Offspring 4: 2 pairs of legs, blue nose What is the most likely genotype for pairs of legs AND for nose color for each of the parents of these offspring? Explain your answer.