Early Human Embryonic Development Quiz
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Early Human Embryonic Development Quiz

Test your knowledge of human development stages with this quiz. From fertilization to the formation of the morula, this quiz covers the key events and processes involved in the early stages of human embryonic development.

Created by
@PerfectBowenite

Questions and Answers

What is the result of the union of sperm and egg?

Diploid organism

Where does fertilization mostly occur?

Fallopian tube

What do morula cells do after reaching the 8-cell stage?

Compact

What can cells at the morula stage develop into?

<p>Any cell type</p> Signup and view all the answers

What is the result of filling the blastula/blastocyst compartment with fluid?

<p>Blastula/blastocyst</p> Signup and view all the answers

What is the outcome of sampling for pre-implantation genetic screening in IVF clinic samples?

<p>Harbored chromosomal abnormalities</p> Signup and view all the answers

What is the result of the blastula/blastocyst stage in human development?

<p>Embryoblast and trophoblast</p> Signup and view all the answers

At what stage does the maternal to zygotic transition start for humans?

<p>8 cell stage</p> Signup and view all the answers

Why is IVF success to live birth about 2 fold more successful using blastocyst stage than morula stage?

<p>Mitotic checkpoints are active</p> Signup and view all the answers

What is the role of trophoblasts in the developing embryo?

<p>Develop into the placenta</p> Signup and view all the answers

What is the function of the fluid-filled compartment called blastocoel?

<p>Provides space for the developing embryo</p> Signup and view all the answers

What is the result of excessive apoptosis during the selection for euploid cells in the developing embryo?

<p>Loss of conceptus/embryonic lethality</p> Signup and view all the answers

What is the purpose of the formation of the primitive streak on the dorsal side of the developing embryo?

<p>To initiate cellular differentiation</p> Signup and view all the answers

Which layer gives rise to the endoderm in the developing embryo?

<p>Yolk sac</p> Signup and view all the answers

What is the role of the amniotic cavity in the developing embryo?

<p>Forms a fluid-filled compartment</p> Signup and view all the answers

Study Notes

Fertilization and Early Development

  • The result of the union of sperm and egg is fertilization, which mostly occurs in the ampulla of the fallopian tube.
  • After reaching the 8-cell stage, morula cells undergo compaction, resulting in a tight cluster of cells.

Developmental Stages

  • Cells at the morula stage can develop into various cell types, including trophectoderm, embryoblast, and primitive endoderm.
  • The blastula/blastocyst stage is characterized by the filling of a fluid-filled compartment called the blastocoel, which helps to establish the embryonic poles.
  • The result of the blastula/blastocyst stage in human development is the formation of a hollow ball of cells that can implant into the uterine lining.

Pre-implantation Genetic Screening

  • The outcome of sampling for pre-implantation genetic screening in IVF clinic samples is the identification of euploid embryos, which can improve IVF success rates.

Maternal to Zygotic Transition

  • The maternal to zygotic transition starts in humans around the 4- to 8-cell stage, during which the embryo begins to take control of its own development.

IVF Success

  • IVF success to live birth is about 2-fold more successful using the blastocyst stage than the morula stage because the blastocyst stage allows for better selection of euploid embryos.

Trophoblasts and Blastocoel

  • Trophoblasts play a crucial role in the developing embryo, giving rise to the placenta and other supporting tissues.
  • The fluid-filled compartment called the blastocoel helps to establish the embryonic poles and gives rise to the amniotic cavity.

Apoptosis and Euploid Selection

  • Excessive apoptosis during the selection for euploid cells in the developing embryo can result in embryo fragmentation and decreased IVF success.

Gastrulation

  • The formation of the primitive streak on the dorsal side of the developing embryo marks the beginning of gastrulation, during which the embryo undergoes a series of complex cellular movements.
  • The primitive streak gives rise to the endoderm, which is one of the three primary germ layers.

Amniotic Cavity

  • The amniotic cavity, which forms from the blastocoel, provides a protective environment for the developing embryo and eventually forms the amniotic sac.

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