KIN 1Y03: Case Study 1 - IVF

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10 Terms

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identical vs fraternal twins

  • identical - 1 egg, 1 sperm, splits into 2 embryo ⇒ same DNA

    • identical twins

  • fraternal - 2 eggs, 2 sperms, implanted separately w 2 diff placentas

    • dizygotic twinning

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when does fertilization occur

12-24 hours over ovulation

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when does cleavage start

starts 30 hours after ferilization

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when does the morula form

4-5 days after fertilization

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when does the blastocyst form 

5-6 days after fertilization 

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when does implantation occur

7 days after fertilization 

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dichorionic diamniotic

  • splits at morula stage; 2 blastocysts, 2 placentas, 2 amnions

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monochorionic diamiotic

  • splits at hatching (blastocyst breaks free from zona pellucida and preps for implantation — cells will move to one side (inner cell mass) and create fluid-filled cavity 

  • results in 1 blastocyst, 2 inner cell mass, 1 placenta, 2 amnions 

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monochorionic monoamniotic 

  • splits after formation of amniotic sac (7-12 days)

  • results: 1 blastocysts, 1 placenta, 1 amnion 

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conjoined twins

splits after gastrulation (~15+ days — already started to develop the germ layers)