Justin_Sharp_Mouse Genetics Di hybrid_2021 | Student Exploration: Mouse Genetics (Two Traits) _ Gizmos DOWNLOAD TO SCORE OUTSTANDING GRADE A

Student Exploration: Mouse Genetics (Two Traits)

Directions: Follow the instructions to go through the simulation. Respond to the questions and

prompts in the orange boxes.

Vocabulary: allele, genotype, phenotype, probability, Punnett square

[Note to teachers and students: This Gizmo was designed as a follow-up to the Mouse Genetics (One Trait)

Gizmo. We recommend doing that activity before trying this one.]

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? Highlight your answer

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.

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Name: Justin Sharp Date:

A. Four Heads D. One head three tails

B. Three heads, one tail E. Four tails

C. Two heads, two tails F. All are equally likely

The Odds of getting Four Tails in a row are pretty low, so getting the first flip being a 50

Percent chance, 2nd flip being 25 Percent, 3rd Flip, 12.5 Percent, and the 4th Flip being 6.25

Percent. The Answer’s 6.25 Percent.

1. What must be true to have offspring with black fur? For either both or one of the Mice

have black fur.

2. What must be true to have offspring with white fur? For both of the Mice to have

White Fur.

3. What must be true to have offspring with black eyes? For either both or one of the Mice

to have Black Eyes.

4. What must be true to have offspring with red eyes? For both of the Mice to have Red

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 Breed several 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.

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).

3. Predict: Click Clear, and move the two mice from the Holding Cages into the parent box.

4. Experiment: Click Breed, and record the genotypes of the offspring on a sheet of paper. Repeat this

several times to see a variety of offspring. What genotypes do you see?

5. Extend: Turn on Show statistics, and click Breed until there are 100 offspring.

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Eyes.

5. What must be true to have offspring with red eyes and white fur? For both of the Mice to have Red

Eyes, and White Fur.

Activity A:

Exploring

inheritance

Get the Gizmo ready:

● Click Clear.

● Turn on Show genotype.

A. What is the genotype of the black-fur parent? FF, and EE.

B. What is the genotype of the white-fur parent? ff, and ee.

C. What are the genotypes of the offspring? Ff, and Ee.

What is the probability that an offspring mouse will have black fur and black eyes? 100%

What do you expect the offspring of these mice to look like? Black Fur, Black Eyes.

ff, EE - FF, Ee - ff, Ee - FF, EE - Ff, ee - FF, ee.

A. How many offspring have black fur and black eyes? 49.

B. How many offspring have black fur and red eyes? 24.

C. How many offspring have white fur and black eyes? 17.

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