1. Do Now  Look on the board and write down the name that you choose for our class skeleton. The winner will be announced tomorrow!

2. Twins!  Do you know more people who are identical twins or fraternal twins?

3. “Answers”  Identical twins: 3 in every 1000 deliveries  Fraternal twins: Depends on the mother! (Fathers have no effect)  6 in every 1000 births in Japan  14 in every 1000 births in Africa  More common for older mothers (rates double for women 35+!)

4. FERTILIZATION

5. Fertilization & Twins  http://www.youtube.com/watch?v=-e5ODsf_TEk http://www.youtube.com/watch?v=-e5ODsf_TEk

6. Youtube!  Take notes  http://www.youtube.com/watch?v=BFrVmDgh4v4 http://www.youtube.com/watch?v=BFrVmDgh4v4

7. Twins  http://www.youtube.com/watch?v=WQNtXCmf-T8 http://www.youtube.com/watch?v=WQNtXCmf-T8  How it works  http://www.youtube.com/watch?v=oWH4UvMKJPA http://www.youtube.com/watch?v=oWH4UvMKJPA  12 year old eggs?

8. Fertilization Worksheet  Worksheet FYI..  Due as a PACKET on Monday