Name: ______________________________
Period: _____ Date: _____
Hardy Weinberg with Natural Disaster
This investigation is designed to help you understand how adaptation is a factor in natural selection.
Procedures:
1. Spread your fabric “habitat” on a flat surface.
2. Select a game warden. The rest of the group will serve as predators.
3. Count out 20 of each band color. While the predators have their backs turned (no peeking!), the game warden
distributes these dots across the habitat (fabric).
4. When the game warden says, “Go!” the predators should turn around, face the habitat, and pick up as many
prey (bands) as they can in a 10-second interval. PREDATORS CAN PICK UP ONLY ONE DOT AT A TIME,
USING ONLY ONE HAND. The game warden should monitor that no scooping or grabbing of several bands
occurs. The recorder should monitor the time.
5. After Predation I is complete, students should gather and count the “dead prey” that they captured and record
that number in Data Table I. Place the dead ones back into their corresponding color bags. The “surviving”
bands should be sorted and counted by color, and the recorder enters the number of Surviving Predation I bands
by color in Data Table
6. For Each Surviving band, add a band of the same color.
Record the total number of each color of in the Generation II column of Data Table I. (Ex: if there were 6
surviving white bands, then each one leaves offspring and you end up with 12 white bands for Generation II).
7. While the predators turn their backs, the game warden distributes the bands of the Generation II (Survivors I
and Their Offspring I) across the habitat (fabric).
8. Repeat steps 4-5, recording the numbers in the Number of Prey Dead II and Surviving Predation II columns
of Data Table I. Continue this process for two more generations.
Before predations begins in generation II mother nature rears her ugly head. A major fire occurs and
scorches the habitat leaving everything charred. Replace the original background with the black
background and continue.
Band
Color
Generation I
Original
Population
White
20
Purple
20
Band
Color
Generation IV
Number
of Prey
Dead I
Surviving
Predation
I
Generation
II (Surviving I
Number
of Prey
Dead IV
Surviving
predation
IV
Generation V
+
Offspring I)
Number
of Prey
Dead II
Surviving
Predation
II
Generation
III (Surviving II
+
Offspring II)
Number
of Prey
Dead III
Surviving
Predation
III
Generation
IV
(Surviving III +
Offspring III)
White
Purple
Assume that Pink is the dominant trait (W) and white is the recessive trait (w) using hardy Weinberg equations
find the gene frequency of W and w and the % of individuals (homozygous dominant, heterozygous,
homozygous recessive) for each generation
Name: ______________________________
Period: _____ Date: _____
Generation I
Number of White individuals __________.
Number of Purple individuals ___________.
% white _________ % Purple_____________
p = ___________________ q = _______________
p2 = __________ 2pq = ___________ q2 = _______________
Generation II
Number of White individuals __________.
Number of Purple individuals ___________.
% white _________ % Purple_____________
p = ___________________ q = _______________
p2 = __________ 2pq = ___________ q2 = _______________
Generation III
Number of White individuals __________.
Number of Purple individuals ___________.
% white _________ % Purple_____________
p = ___________________ q = _______________
p2 = __________ 2pq = ___________ q2 = _______________
Generation IV
Number of White individuals __________.
Number of Purple individuals ___________.
% white _________ % Purple_____________
p = ___________________ q = _______________
p2 = __________ 2pq = ___________ q2 = _______________
Generation V
Number of White individuals __________.
Number of Purple individuals ___________.
% white _________ % Purple_____________
p = ___________________ q = _______________
p2 = __________ 2pq = ___________ q2 = _______________
Name: ______________________________
Period: _____ Date: _____
Graph the allele frequency for each generation over time (p and q)
Graph the Individual frequency of each generation over time (p2,2pq, q2)
Name: ______________________________
Period: _____ Date: _____
1) Explain what happened to the Allele frequency over time
____________________________________________________________________________________
____________________________________________________________________________________
2) Explain what happened to the individuals frequency over time
____________________________________________________________________________________
____________________________________________________________________________________
3) Is evolution occurring? ____________
4) What evidence supports your answer
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
5) Compare your graphs to the first set of graphs. Did the fitness of either band change?__________
6) What caused the change? _____________________________________________________________
7) What type of selection does this represent?_______________________________________________