1. What is artificial Embryo Twinning? Krine Mélanie Massiquot Quentin Xavier Elodie BIO AC 1 2014-2015

2. We will compare artificial and natural systems With artificial bissection : -Bissection of artificial embryos after fertilisation ( 2 methods ) With natural bissection : -What is the difference between true twins and false twins

3. - Bissection of an embryo 2 days after fertilisation -Bissection of an embryo 5 to 7 days after fertilisation Bissection artificial:

4. Newborns are genecally identical Artificial bissection : (In vitro)

5. The Natural Process

6. Identical Twins (monozygotic)

8. Some figures : Between 1979 and 2009, twin births increased by 79% late 2009 -210,693 families had at least multiple births: in 98% of cases, it resulted in twins France has among its population, not less than 2 million twins

10. Dizygotic or Heterozygous twins - Called fraternal twins - D- Difference: simultaneity of gestation - Each dissimilar genetic heritage (different genes) -C-Can be of a different sex or of the same sex

11. This technique : artificial embryo twinning allows to amplify opportunities for reproduction (in cases of infertility for example) Conclusion :