Download Selective Breeding - Georgia Standards

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Georgia Performance Standards Framework for Life Science- 7th Grade
Unit: Heredity ~ Genetics
Differentiated (Tiered) Task
Selective Breeding
Subject Area: Science
Grade: 7th
Standards (Content and Characteristics):
S7L3: Students will recognize how biological traits are passed on to successive generations.
a. Explain the role of genes and chromosomes in the process of inheriting a specific trait.
c. Recognize that selective breeding can produce plants or animals with desired traits.
Enduring Understanding: Selective breeding is used to produce organisms with desired traits.
Essential Question(s): How does selective breeding work?
Pre-Assessment: Have students create a graphic organizer such as a web diagram where they
list all they know about selective breeding.
BASIC
Outcome/
Performance Level
Indicator
Performance
Task:
(Detailed
Description)
Teacher role?
Student role?
INTERMEDIATE
ADVANCED
Students will use Punnett squares to recognize that selective breeding
produces desired traits.
Students will be given
two traits and will create
illustrated Punnett
squares to demonstrate
how selective breeding
is used to produce
offspring with desired
traits.
Student Role:
• Students will be
given the scenario
that a plant nursery
wants to create
plants that always
have purple blooms
since those are the
colors most desired
Students will be given
the scenario that a
plant nursery wants to
create plants that
always have purple
blooms since those
are the colors most
desired by consumers.
One plant is
heterozygous
dominant and the
other is homozygous
recessive.
Student Role:
• Students will
create a series of
Punnett squares to
Georgia Department of Education
Kathy Cox, State Superintendent of Schools
Life Science y 7th Grade y Energy Flow and Nutrient Cycling
August 8, 2007y Page 1 of 4
Copyright 2007 © All Rights Reserved Students will
investigate how dogs
have been selectively
bred to produce
desired traits by
listening to the guest
speaker and locating
information in
materials provided by
the teacher.
Student Role:
• Student will
compile
information about
selective breeding
in dogs.
One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade
by consumers.
•
•
•
Students will be
given a picture of a
purple plant on a
•
colored sheet of
paper with its
heterozygous
genotype listed.
They will also be
•
given a picture of a
white plant on a
piece of transparency
film with its
homozygous
recessive genotype
listed.
Students will cut the
pictures apart to
illustrate the alleles
that make up the
genotype.
•
Students will fill in
•
their Punnett squares
and record the
phenotype. They
will use their
pictures to help with
this process. (The
recessive traits on
the transparency film
will not “show up”
on top of the
dominant trait on
colored paper) paste
those pictures into
the blank Punnett
square provided by
the teacher to show
the cross between the
two organisms.
illustrate the
•
process of
selective breeding.
Students will
record the
genotypes and
phenotypes of
each generation.
Students will
record the
percentage of
offspring with the
resulting
phenotypes for
each generation.
Teacher Role:
Review Punnett
squares,
dominant/recessiv
e traits, and alleles
Introduce the
concept of
selective breeding
Georgia Department of Education
Kathy Cox, State Superintendent of Schools
Life Science y 7th Grade y Energy Flow and Nutrient Cycling
August 8, 2007y Page 2 of 4
Copyright 2007 © All Rights Reserved
Students will
create a series of
Punnett squares to
illustrate the
process of
selective
breeding.
•
Students will
record the
genotypes and
phenotypes of
each generation.
•
Students will
record the
percentage of
offspring with the
resulting
phenotypes for
each generation.
•
Students may
choose to create a
multimedia story
(i.e., Photostory
3, free software
from Microsoft)
or a hard copied
children’s book
that
communicates the
information that
they learned about
selective breeding
in dogs including
its pros and cons.
Teacher Role:
• Introduce the
concept of
selective
breeding.
One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade
•
Students will be
instructed to choose
two offspring from
the first match and
repeat the steps.
•
Students will repeat
this process until
they have Punnett
squares in which
100% of the
offspring are purple.
Teacher Role:
• Review Punnett
squares,
dominant/recessive
traits, and alleles
•
Introduce the
concept of selective
breeding
•
Provide blank
Punnett squares.
•
Arrange for a
local veterinarian
to come speak to
students about
selective breeding
of dogs, both the
benefits and
possible pitfalls.
•
Provide resource
materials and give
opportunity for
research
•
Resources
Provide multiple
pictures of the
genetic traits.
Markers, glue, pictures
of plants as described,
blank Punnett squares
Classroom text
resources, paper,
pencil
Computer, classroom
text resources, guest
speaker
Extension: Repeat the
process for a recessive
trait.
Compare/Contrast
Extension: Students
can research how
“selective breeding”
has occurred as a
result of evolution.
Homework/Extens
ion
Extension: Repeat the
process for the recessive
trait. Compare/Contrast
Instructional
Tasks
Accommodations
for ELL Students
Pair with proficient speaker.
Allow students to use native language resources for research.
Hand out to show different steps in completing a Punnett square.
Georgia Department of Education
Kathy Cox, State Superintendent of Schools
Life Science y 7th Grade y Energy Flow and Nutrient Cycling
August 8, 2007y Page 3 of 4
Copyright 2007 © All Rights Reserved
One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade
Instructional
Tasks
Accommodations
for Students with
Specific
Disabilities
Instructional
Tasks
Accommodations
for Gifted
Students
Limit the resources the students can use for research. Identify websites
students may use for research. Allow students to type research results.
Use colored Punnett squares or number Punnett squares to help students
remain organized.
Have students research how modern agriculture practices are using
selective breeding to make the products more marketable. What are some
of the potential consequences of these procedures?
Georgia Department of Education
Kathy Cox, State Superintendent of Schools
Life Science y 7th Grade y Energy Flow and Nutrient Cycling
August 8, 2007y Page 4 of 4
Copyright 2007 © All Rights Reserved