GIZMO Mouse Genetics (One Trait) | Student Exploration: Mouse Genetics (One Trait) -ALL ANSWERS ARE CORRECT

Student Exploration: Mouse Genetics (One Trait) Vocabulary: allele, DNA, dominant allele, gene, genotype, heredity, heterozygous, homozygous, hybrid, inheritance, phenotype, Punnett square, recessive allele, trait Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. The image shows a single litter of kittens. How are they similar to one another? They all have a little of white and are kittens. 2. How do they differ from one another? Some have orange, brown, or black. 3. What do you think their parents looked like? I’m guessing orange and white or black and white. Gizmo Warm-up Heredity is the passage of genetic information from parents to offspring. The rules of inheritance were discovered in the 19th century by Gregor Mendel. With the Mouse Genetics (One Trait) Gizmo™, you will study how one trait, or feature, is inherited. 1. Drag two black mice into the Parent 1 and Parent 2 boxes. Click Breed several times. What do the offspring look like? The mice are black. The appearance of each mouse is also called its phenotype. 2. Click Clear, and drag two white mice into the parent boxes. Click Breed several times. What is the phenotype of the offspring now? The mice are white. 3. Do you think mouse offspring will always look like their parents? Yes, they are mice. Activity A: Patterns of • inheritance Get the Gizmo ready: Click Clear. • Drag a black mouse and a white mouse into the parent boxes, but don’t click Breed yet. Question: What patterns are shown by offspring traits? 1. Predict: What do you think the offspring of a black mouse and a white mouse will look like? Could be black, white, or spotted black and white. 2. Observe: Click Breed several times. What do you see? _ All the mice are black. 3. Observe: Drag two offspring into the Holding Cages. These mice are called hybrids because their parents had different traits. Click Clear, and then breed the two hybrids. What do you see now? 4 black mice and 1 white mouse. 4. Experiment: Turn on Show statistics. Click Breed until there are 100 offspring. How many offspring were black? 77 How many were white? 23 5. Explore: Try other combinations of mouse parents. Write the results of each experiment in your notes. When you have finished, answer the following questions. (Note: You can refer to the parents as “pure black,” “pure white,” or “hybrid.”) A. Which parent combination(s) yield only white offspring? When the parents are both pure white mice. B. Which parent combination(s) yield only black offspring? When the parents are pure black. C. Which parent combination(s) yield a mixture of black and white offspring? Any hybrid or mix of pure black and white parents.