Download GENETICS - UNT's College of Education

TAKS Objective 2
The student will
demonstrate an
understanding of living
systems and the
environment
TEKS 8.11 B
Distinguish between
inherited traits and other
characteristics that result
from interactions with the
environment
Killer Rays
 ENGAGE
Visit this website:
http://www.epa.gov/sunwise/uvindex.html
UV Index
0-2 minimal
3-4 low
5-6 moderate
7-9 high
10+ very high
EXPLORE
• Make a UV bead bracelet using the
materials provided by your teacher.
• Wrap UV beads in each of the three types
of fabrics. Place the fabric-wrapped UV
beads in a plastic Ziploc® bag and expose
it to direct sunlight. Remember to include a
control. Record your results.
EXPLAIN
The UV beads contain a pigment that
changes color in the presence of
ultraviolet radiation from the sun
Ozone layer reflects or absorbs 99% of
damaging UV rays from the sun
There are a number of activities and events
that cause ozone destruction:
• Hydrogen bomb testing
• CFCs (chlorofluorocarbons) in aerosols
and refrigerants
• Exhaust gases from supersonic aircraft
• Fertilizers and
• Volcanic eruptions.
SPF of Clothing
• Cotton shirt – SPF 7
• Denim jeans – SPF 95-100
• Polyester/lycra surf shirt – SPF 35
ELABORATE
• At home, try different types of sunscreen or
liquid makeup.
• At home, place some beads under a sunglass
lens in an area that is exposed to direct sunlight.
If the beads remain white, then your sunglasses
are blocking harmful ultraviolet rays. Test
different pairs of sunglasses.
• MD Anderson Sun Safety
Project S.A.F.E.T.Y
MD Anderson
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Sun
Awareness
For
Educating
Today’s
Youth
• For Project SAFETY
information call
• 713-745-1205
Measure Your Sun Awareness
• Pretest
• Label parts of the skin (animation)
– Epidermis
– Dermis
– Basal cells
– Melanocytes
– Melanin
– Squamous cells
Reasons for Increased Cancer
• 1/3 of people living in the sunbelt will
develop skin cancer in their lifetime (see
handout)
• Depletion of the ozone
• Cultural and lifestyle changes (e.g., dress,
entertainment outdoors)
• Tanning beds
Risk factors
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Sun exposure
Family history
Geographic location
Tendency to freckle or burn
Hair and skin type
Unnoticed skin lesions for darker skinned
individuals
• Discovery and diagnosis of melanoma at a late
stage of development for darker skinned
individuals
Types of Skin Cancer
• Basal cell carcinoma – slow, seldom
spreads, often appears as an enlarged
pearly or waxy nodule
• Squamous cell carcinoma – present in
darker skinned people, may metastasize,
may appear as a red areas with a crust
that does not heal
• Melanoma – can occur at a young age and
can metastasize rapidly to all parts of the
body, originate from moles
ABCD
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Asymmetry (PS2-49 animation)
Border irregularity (PS2-50 animation)
Color variation (2 or more colors)
Diameter (6 mm which is about the size of
the top of a pencil eraser)
Let’s Look at a Few Video Clips
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What is a tan?
Look of skin cancer.
SPF
Shadow Test
Terri’s Story
Grace’s Story
Questions
1. Which part of the skin shows freckles, moles,
and wrinkles?
2. What is the deepest layer of the skin called
3. What component of the skin creates a tan?
4. Which cells are located at the base of the
epidermis?
5. Which cells make up the majority of the
epidermis?
More Questions
6. In what layer of the skin do we find blood
and lymph vessels?
7. What are the 3 types of skin cancer?
8. What are the ABCs of melanoma?
9. How can you reduce you chance of skin
cancer?
EVALUATE
During the learning activity, “Exploring the
Effect of UV Radiation, the student will
record hypotheses, collect data and draw
conclusions for each experiment on the
handout provided by the teacher. A
completion grade will be given.
Complete the Posttest for sun safety