Objective: SWBAT apply what they have learned about light absorption and engage in written argumentation by analyzing world sun data
Do Now:
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Question 1
1.
What do you observe about the energy that reaches the skin cells from the UV light when melanin is blocking the genetic material?
Exit Ticket Review:
Student 1:
Student 2:
Melanin inside our cells determines our hair, skin, and eye colors. For example, people with blond hair and pale skin tones don't have very much melanin in their hair and skin. People with dark hair and pale skin tones have a lot of melanin in their hair, but not very much melanin in their skin. People with dark hair and dark skin tones have a lot of melanin in both their hair and their skin
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Question 2
2.
What is this paragraph trying to tell me?
Melanin doesn’t just help determine our appearance—it also protects our skin against damage from the sun.
The sun emits ultraviolet (UV) light that can damage our skin, leading to sunburns and even skin cancer. Skin cancer is a disease caused by damage to the DNA inside our skin cells. DNA is the genetic material found inside the nuclei of our cells. DNA can be damaged when it absorbs energy from UV light. Skin cancer does not happen every time the DNA in our skin is damaged, but the more it is damaged the more likely it is that cancer can develop.
The melanin in skin cells can absorb UV light as the light enters the cells, before it gets to the nucleus where it can damage the DNA. The more melanin there is inside a cell, the more energy is absorbed before UV light can reach the nucleus and cause damage. This means that people with a lot of melanin in their skin have more protection against skin damage from UV light. More melanin gives people more protection against skin damage, but it doesn't give them complete protection. Anyone can get skin cancer, whatever the level of melanin in their skin.
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Question 3
3.
What is the author trying to say in this segment?
People can actually make more melanin in response to being exposed to UV light. This is what we call a suntan. The skin gets darker because the body starts producing more melanin to protect its DNA. However, a suntan only provides some protection against UV light. UV light can still get through and lead to DNA damage.
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Question 4
4.
Prompt: How does melanin provide protection against skin cancer?
Examine and annotate this screenshot from the Sim, then write an explanation of how this evidence helps answer the question. Use the following words in your explanation:
absorb
energy
light
CFS:
Accurately identifies the type of light reactions that cause changes in objects
Accurately describes the relationship between wave properties and outcomes
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Question 5
5.
Compare the graphs. What does the evidence show is a difference between the two groups?
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Question 6
6.
The World Ultraviolet (UV) Light Map below shows the amount of UV light reaching the surface. Examine and annotate the map, using the questions below to guide you.
What does the evidence show?
Exit Ticket:
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Question 7
7.
How does this evidence (melanin and UV) help explain why the skin cancer rate is higher in Australia than in Brazil, even though the two countries get the same amount of sunlight?
CFS:
Accurately identifies the type of light reactions that cause changes in objects
Accurately describes the relationship between light interaction and outcomes