Student Exploration: Mouse Genetics (Two Traits)
Vocabulary: allele, genotype, phenotype, probability, Punnett square
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. A single coin is flipped four times. What do you think is the most likely outcome?
2.What do you think are the odds of getting four tails in a row? Explain your answer.
Gizmo Warm-up On the Mouse Genetics (Two Traits) Gizmo, drag mice into the Parent 1 and Parent 2 spaces, and then click Breed to see their offspring. Experiment with different combinations of parent mice.
1. What must be true to have offspring with black fur?
2.What must be true to have offspring with white fur?
3.What must be true to have offspring with black eyes?
4.What must be true to have offspring with red eyes? What must be true to have offspring with red eyes and white fur?
Question: What patterns appear when two traits are inherited?
1. Observe: Breed a black-fur, black-eye mouse with a white-fur, red-eye mouse. Click Breedseveral times, and then drag two of the offspring into the Holding Cages below. Move the cursor over a mouse to see its genotype, or allele combination.
What is the genotype of the black-fur parent?
What is the genotype of the white-fur parent?
What are the genotypes of the offspring?
2.Analyze: The probability of an event is the likelihood that it will happen. Probability can be expressed as a percentage, such as 75%, as a decimal (0.75), or as a fraction (3/4).
What is the probability that an offspring mouse will have black fur and black eyes?
3.Predict: Click Clear, and move the two mice from the Holding Cages into the parent box.
What do you expect the offspring of these mice to look like?