1. KARYOTYPING

2. DO NOW- REVIEW: How many chromosomes do we have?
Why do we have 2 (sets) of chromosomes? What are these called?
How can you tell the gender based on a karyotype? What are the genotypes of each?
Sex chromosomes vs. autosomes?
What is it about the Y that forms males as opposed to the X that forms females?

3. KARYOTYPE How many chromosomes do we have?
Why do we have 2 (sets) of chromosomes?
What are these called?
How can you tell the gender based on a karyotype? What are the genotypes of each?
Is this picture taken before or after the S phase?

4. Sex chromosomes vs. autosomes?

5. What is it about the Y that forms males as opposed to the X that forms females?

6. SRY GENE and development.
What is the SrY gene?
What does it produce?
Why does it matter when testosterone is present in development?

7. DEVELOPMENT INTERNAL (7-8 weeks) EXTERNAL (2-3 months)
Testosterone? Male
NO testosterone? Female
EXTERNAL (2-3 months)

8. PRACTICE PROBLEM
A female boy builder is taking steroids (testosterone). She doesn’t realize she becomes pregnant until 10 weeks. A sperm carrying an X fertilized her egg. After she finds out she is pregnant, she immediately stops taking steroids and the rest of the pregnancy.
What is the child’s genotype?______
What is the child’s gender (genotipically)? ________
What internal organs does the child have? __________
What external organs does this child have? __________
How would this child develop? _____________________

9. MORE KARYOTYPING DO NOW: What are karyotypes used for?
How are the chromosomes arranged?
Which sex chromosome determines gender? Why?
How can you determine the kind of disorder based on a karyotype?
ONLINE ACTIVITY: karyotyping.html

10. ABNORMALITIES: Research the karyotypes of the following and indicate what abnormalities (if any) exist.
1. A normal male, 2. A normal female 3. A female with Turner's Syndrome 4. A female with Triple X Syndrome 5. A male with Klinefelter's Syndrome 6. A male with Patau's Syndrome 7. A female with Patau's Syndrome 8. A male with Edward's Syndrome 9. A female with Edward's Syndrome 10. A male with Down's Syndrome 11. A female with Down's Syndrome 12. A male with Trisomy A female with Trisomy A male with XYY

11. MORE ONLINE PRACTICE….
Online practice: ook4.html
Review for quiz