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Disease
Albinism
Tay-Sachs
Cri-du-chat
Down Syndrome
Dwarfism
Polydacyly
*Tay-Sachs Video
*Down Syndrome
What chromosome
causes the
mutation?
What happens to a
human possessing
the mutation?
What does this
mean for DNA?
Chromosome 11,
Parents with recessive
gene may hesitate to
have kids,
Announcements
• Short quiz on Friday covering DNA and RNA.
Stations
• There will be an exit ticket at the end of class
about the information from the stations.
• You need to stay on TRACK.
• 10 minutes per station.
• WARNING: I’m going to try something new. At
a few points I’ll give a countdown, when I do
YOU NEED TO FIND A PARTNER ASAP!
Finish your station early?
• Answer the following on the back:
1. Explain what happens during a deletion and insertion
mutation.
2. Explain what I mean by a frameshift mutation.
▫
Remember the sentence: The cat sat in a hat.
▫
I haven’t taught this yet!
3. What’s the job of our DNA?
4. What’s the job of our RNA?
5. How are DNA and RNA related? How do they work
together?
6. What do you think I mean by a “dominant gene?”
7. What do you think I mean by a “recessive gene?”
8. Complete the complementary DNA strand: A _ C _ G
_T_G_A_T_G_C_
9. Complete the complementary RNA strand: U _ A _ G
_ C _ C _ A _ U _ C_ _ C
Exit Ticket
1. Explain what happens during Tay-Sachs disease.
2. What is polydactyly?
3. What does it mean for someone to have Down
Syndrome and how does it affect their DNA?
4. We’re talking about mutations. What questions do
you still have?
5. We’ve talked about dwarfism before during the
endocrine system. Compare and contrast the two
different types of dwarfism we have learned.
Dominant and Recessive
Genes
• A dominant gene is the gene that will be
expressed if one of the parents has the
trait.
• A recessive gene must have two recessive
genes in order to be expressed.
Pedigree
• A pedigree is a diagram of family
relationships that includes two or more
generations.