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Twins

Twins. Do Now. After watching the video, reflect on what life would be like as a twin On a whiteboard: What are two benefits and two limitations of living life as a twin?. What are twins?. Two children born at the same time (mother goes into labor once). Identical twins vs. Fraternal twins.

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Twins

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  1. Twins

  2. Do Now • After watching the video, reflect on what life would be like as a twin • On a whiteboard: • What are two benefits and two limitations of living life as a twin?

  3. What are twins? • Two children born at the same time (mother goes into labor once)

  4. Identical twins vs. Fraternal twins • Identical twins • One sperm (dad) fertilizes one egg (mom) • Fertilized egg splits and forms two babies that are genetically identical • Fraternal twins • Two sperm (dad) fertilizes two eggs (mom) • Each fertilized egg develops independently in the mom until birth (same as brothers or sisters, but born at the same time; can even be different genders)

  5. What are the chances of having twins? • Only 1-2% chance of having twins • Certain conditions may increase those chances • Ex. Medications (fertility drugs that increase the number of egg cells released each month)

  6. Special Cases • Conjoined (Siamese) twins • Formed when the fertilized egg (zygote) does not split completely for identical twins

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