genetics investigating human traits. investigating human traits 2/6/15 key question: what do we...
TRANSCRIPT
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Genetics
Investigating Human Traits
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Investigating Human Traits2/6/15
Key Question: What do we inherit from our parents?
Initial Thoughts:
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Characteristic vs. Trait
• Characteristic - i.e. Eye Color
• Trait - different versions of a characteristic; i.e. brown, blue, green
• How much variation is shown in our class?
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Evidence: Trait Survey
• Tongue rolling• Paper tasting (PTC)• Widow’s peak• Attached earlobes• Curly/ Straight Hair• Freckles• Cleft chin• Eye color• Straight/ Bent little
fingers
• Dimples• Nose shape• Mid-digit finger hair• Dark/blonde hair• Non-red/red hair• Handedness
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Trait Table Traits: Tongue Rolling
http://www.ncrtec.org/tl/camp/gene/curl.jpg
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Trait Table Traits: Widow’s Peak
Peak!
No peak!
http://images.google.com/imgres?imgurl=student.biology.arizona.edu/sciconn/heredity/graphics/widow2.gif&imgrefurl=http://student.biology.arizona.edu/sciconn/heredity/worksheet_heredity.html&h=131&w=100&prev=/images%3Fq%3Dwidow%2527s%2Bpeak%26start%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3DN
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Trait Table Traits: Not Attached vs. Attached Earlobes
http://student.biology.arizona.edu/sciconn/heredity/graphics/nolobe.gif
http://www.edquest.ca/Projects/GHTS/FET.jpg
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Trait Table Traits: Freckles on Face
http://www.szarvas.org/freckles.jpg
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Taste Test
• http://learn.genetics.utah.edu/content/inheritance/ptc/
• PTC – No taste, bitter, extremely bitter• Sodium Benzoate – no taste, salty, bitter, sweet
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Trait Survey
• You and your elbow partner will fill-out the hereditary traits results.
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Human TraitsN
um
ber
of
Peo
ple
Traits
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Analysis Questions
1. What is the conclusion of your graph?
2. What would happen if you were able to ask more people?
3. List your individual traits.
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Summary
• What did you think about the variation of
human traits before this lesson?
• What does your evidence show you that
you learned about the variation of human
traits?
• What are some thoughts or questions
you have about human traits?
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Reflection
• Create an analogy for characteristics and traits.
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Big Idea
• We inherit genes from our parents which result in us having different traits.