Name: ____________________________________________________ Date: ______________
Mendel’s Experiments
Go to the website: http://www2.edc.org/weblabs/Mendel/mendel.html
Section 1 - Introduction
1. What is Mendel know for?
2. What plant did Mendel study?
Section 2 – Creating Five Crosses
3. Examine the peas you planted. How many different traits do you see?
Circle one: 4
5
6
7
4. List all of the different traits for each of the plants that Mendel plants.
a.
d.
b.
e.
c.
f.
g.
TESTING INDEPENDENT VARIABLES
Make five crosses between two plants and list the offspring. Look at only one trait at a time. For example, see the
example cross between a purple flowered pea plant and a white flowered pea plant.
CROSS #1 Trait being observed Flower Color - Parent 1 Purple X Parent 2 White
Possible offspring:
b. purple
d. purple
a. purple
c. white
e. white
What do you think is the dominant trait? _ Purple___
CROSS #1 Trait being observing
Possible offspring
a.
CROSS #2 Trait being observing
Possible offspring
a.
CROSS #3 Trait being observing
Possible offspring
a.
CROSS #4 Trait being observing
Possible offspring
a.
CROSS #5 Trait being observing
Possible offspring
a.
: Parent 1
X Parent 2
b.
d.
c.
e.
What do you think is the dominant trait? ____________
: Parent 1
X Parent 2
b.
d.
c.
e.
What do you think is the dominant trait? ____________
: Parent 1
X Parent 2
b.
d.
c.
e.
What do you think is the dominant trait? ____________
: Parent 1
X Parent 2
b.
d.
c.
e.
What do you think is the dominant trait? ____________
: Parent 1
X Parent 2
b.
d.
c.
e.
What do you think is the dominant trait? ____________
Section 3 – Predicting Results
7. Looking at pea shape on this plant. Cross this plant with itself. The initial plant is the parent (P) generation. What pea
shapes do the possible offspring (F1 generation) have?
Possible offspring
b.
d.
a.
c.
e.
What is surprising about the F1 generation results?
Cross the offspring (F1) generation with itself. This produces the F2 generation. This is kind of like grandchildren
of the initial plant.
Possible offspring
b.
d.
a.
c.
e.
What is surprising about the F2 generation results?
Which shape is recessive?
Wrinkled
Round
8. What did you learn about your peas?
9. If you are given two plants with wrinkled seeds (peas), the offspring will have(Circle One):
Some Round
Some Wrinkled
All Wrinkled
All Round
Can’t predict
Was your prediction correct? Circle one: Yes or No
What information led you to this prediction?
10. What did Mendel call traits that appear to mask or hide other traits? _________________
11. What did Mendel call traits that seem to be hidden? ______________________________
Section 5 – Explore
By crossing the different plants and checking out the pedigrees, determine which traits are dominant and recessive.
Dominant
Trait
Recessive
Flower Color
Flower Position
Plant Height
Seed Color
Seed Shape
Pod Color
Pod Shape