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Genetic drift worksheet
Glue on page 32
Fill in charts and yell “checkpoint”
individually. Then answer all questions
Draw if you need to
Number alleles
Number of falcons
HH
Hh
hh
Before lightning
6
8
6
After lightning
1
4
5
H
h
Tota
l
Before lightning
After lightning
Number of jerboas
FF (homo dom)
Ff (hetero)
ff (homo rec)
Before tsunami
10
30
10
Number alleles
After tsunami
9
6
5
Before tsunami
After tsunami
F
f
Total
•Pick up YOUR
rainbow fish from blue
box, period 6 folder
and glue it to pg 37
Lightening
1) H alleles was DECREASED
2) h allele was INCREASED
3) Falcons will have more small beaks since
more of those survived the lightening strike
4) This is genetic drift because the ones that
survived was RANDOM
Tsunami
1) F alleles INCREASED
2) f allele DECREASED
3) Jerboas will have more thick fured individuals
in the future since more of those survived
4) This is genetic drift because the ones that
survived was RANDOM
Track worksheets on pg 9
8c (pgs 28-29; 32)
------------------------------------------------------Standard 7d
I can determine why
variation is necessary
for the survival of a
population.
Meiosis and Mutations create
variation among individuals
Why do you NEED variation in a
species?
Why not look identical?
On the TOP of pg 33
Draw 2 populations
(many individuals of the same species)
1) High diversity/variation
2) Low diversity/variation
EXPLAIN--Which population is more likely
to survive an environmental change, one
with great diversity/variation or one with
little
diversity/variation?
How did variation save the
Peppered Moth species?
Bottom of page 33
• Peppered moth variation is ________ and
_______. When
__________happened___________________
(use individual, environment, and variation in
answer)
• https://kleinsclasses.wikispaces.com/file/view/ap
es-05-moth_change.swf
Selection Graphs
Look at allele frequency BEFORE and AFTER
Page 34
• Types of Selection
• The
middle/average is
selected for
Directional Selection
• The
phenotypes
on one end
are
selected for
Disruptive selection—The
phenotype in the middle is selected
AGAINST
Glue on pg 35-36
• Number 1--Giraffes
•
•
•
•
A—Label most fit on graph A
B—Label least fit on graph A
C—Draw graph B
D— What type of selection?
• Geographic
isolation
• Population
• Reproductive
isolation
• Natural
selection
• Reproductive
barriers
• Speciation
Find new seat and
pick up a “When polar bears and
grizzlies mate” article
Make 4 boxes on pg 31
Box 1—Summarize article
Box 2—How does this article
connect with this class
Box 3—Draw a diagram related
to this article
Box 4—What you want to know
more about
Summary
How this connects with
the class
Diagram
What you want to know
more about
• Grizzly–polar bear
hybrid
(also pizzly bear, prizzly
bear, or grolar bear
• Not sterile so they can
make healthy babies!
• Sterile means you can’t
have babies
Grades this Thursday
• 2 quizzes make up your grade—7a, 8d, 8a
• Retake quizzes this week
• Work habits grade based on if you come
into tutoring
8.d I know how reproductive or geographic isolation affects speciation.
1. Speciation requires which of the following?
A. Behavioral Isolation
B. Geographic Isolation
2. Which of the following is NOT a pre-zygotic isolating
mechanism?
C. production of sterile hybrids
3. Behavioral isolating mechanisms may occur when two species
have different
B. courtship displays
4. A species is defined as individuals that
B. can reproduce with each other
• Explain how one species of mushroom can become
two species of mushroom. Underline key terms and
include how you know they are two separate species.
-There was a geographic barrier that separated the
mushrooms. On both sides there were mutations.
These mutations gave an advantage and those
mushrooms were able to eat more and reproduce
more.
-We know we have two species of mushrooms because
they cannot reproduce and make normal babies.
7.a I know why natural selection acts on the phenotype
rather than the genotype of an organism
6. A predator can see
A. phenotype only
7. Which of the following best describes the difference
between phenotype and genotype?
B. A phenotype is the way a trait is expressed, while a
genotype is the combination of alleles that codes for it.
8. When the environmental conditions change, natural
selection will select individuals that
A.have the traits that are most beneficial
9) In a population of birds, one individual bird has
particularly long wings, which make it better than
its fellow birds at catching prey. However, this
bird is sterile.
• Is natural selection likely to act in this population
to increase the number of birds with this longwinged trait in future generations? Explain.
Sterile means that it cannot have offspring. In
natural selection, the ones with the advantage
can eat more AND have more babies. Since it
cannot have babies this trait will not be passed
on.
10. Give an example of natural selection
acting on the phenotype of an individual.
How does these diagram show
genetic drift?
Marble=Alleles
Genetic Drift affects small or large
populations more? Why?
Small Pop
Large Pop
On the bottom of pg 27
• Genetic drift causes the shift in alleles
• Genetic drift affects small populations
more than large ones
because_____________
Small Pop
Large Pop
Rainbow fish
G is completely dominant to R
G is completely dominant to Y
R and Y are incompletely
dominant
1.What would be the phenotypes for each genotype below
Genotype
GG
GR
GY
YY
RR
RY
Phenotype
#2—Can 2 red fish make a green offspring?
#3—Can 2 orange fish make a yellow
offspring?
#4—is Yes show me how
#5-8
Environment
Change in environment
Rainbow fish
How did the allele frequency change over 4
generations?