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Do Now. Look on the board and write down the name that you choose for our class skeleton. The winner will be announced tomorrow!. Twins!. Do you know more people who are identical twins or fraternal twins?. “Answers”. Identical twins: 3 in every 1000 deliveries

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Presentation Transcript
do now
Do Now
  • Look on the board and write down the name that you choose for our class skeleton. The winner will be announced tomorrow!
twins
Twins!
  • Do you know more people who are identical twins or fraternal twins?
answers
“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+!)
fertilization twins
Fertilization & Twins
  • http://www.youtube.com/watch?v=-e5ODsf_TEk
youtube
Youtube!
  • Take notes
  • http://www.youtube.com/watch?v=BFrVmDgh4v4
twins1
Twins
  • http://www.youtube.com/watch?v=WQNtXCmf-T8
    • How it works
  • http://www.youtube.com/watch?v=oWH4UvMKJPA
    • 12 year old eggs?
fertilization worksheet
Fertilization Worksheet
  • Worksheet FYI..
    • Due as a PACKET on Monday
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