Student Exploration: Mouse Genetics (One Trait)
Directions: Follow the instructions to go through the simulation. Respond to the
questions and prompts in the orange boxes.
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?
m
They all look about the same size and all seem to have spots
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(they aren't all one colour)
co
eH w
2. How do they differ from one another?
o.
rs e
They are all different colours
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3. What do you think their parents looked like?
o
I think maybe their parents had spots as well
aC s
vi y re
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
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(One Trait) Gizmo™, you will study how one trait, or feature,
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is inherited.
1. Drag two black mice into the Parent 1 and Parent 2
boxes. Click Breed to view the five offspring of these
is
parents.
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What do the offspring look like? They are also black
The appearance of each mouse is also called its phenotype.
sh
2. Click Clear, and drag two white mice into the parent boxes. Click Breed several times. What
is the phenotype of the offspring now?
white
3. Do you think mouse offspring will always look like their parents? Explain:
This study source was downloaded by 100000829957125 from CourseHero.com on 08-18-2021 02:41:11 GMT -05:00
, I think that they will always look like their parents because they are purebred which means
they will always look the same.
Activity A: Get the Gizmo ready:
● Click Clear.
Patterns of ● Drag a black mouse and a white mouse into the
inheritance 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?
Their offspring will be black
m
er as
2. Observe Click Breed several times. What do you see?
co
eH w
All the offsprings are black
o.
rs e
3. Observe: Drag two offspring into the Holding Cages. These mice are called hybrids
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because their parents had different traits. Click Clear, and then breed the two hybrids.
What do you see now? There was only one white mouse out of five when i bred
them
o
aC s
4. Experiment: Turn on Show statistics. Click Breed until there are 100 offspring.
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How many offspring were black? 74 How many were white? 26
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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
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the parents as “pure black,” “pure white,” or “hybrid.”)
A. Which parent combination(s) yield only Only if both parents were white mice
is
white offspring?
Th
B. Which parent combination(s) yield only Only if both parents were black mice
black offspring?
C. Which parent combination(s) yields a If one parent was a black mouse and the
sh
mixture of black and white offspring? other was a white mouse
6. Challenge: Based on experiments similar to these, Gregor Mendel devised a theory of
inheritance. Use your own observations to come up with your own explanation of how a trait
such as a fur colour is passed down from parents to offspring. If possible, discuss your
theory with your classmates and teacher.
This study source was downloaded by 100000829957125 from CourseHero.com on 08-18-2021 02:41:11 GMT -05:00
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