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Blood cells within the umbilical cord are considered multipotent. Can develop into more than one cell type, more limited that pluripotent. Can become a lot of things but are more limited.

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Blastocyst is considered pluripotent. Can rise to all of the cell types that make up the body. Example is stem cells. Can make any body structure.

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Totipotent cells have the potential to specialize as any cell. An embryonic cell is only totipotent as a zygote and the early stages of cleavage.

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This is the rapid division of cells, replicating the DNA although the cell does not ever grow in size as it splits. Leads to embryo that can grow in uterus. Starts with one, two, four, eight, then sixteen. Process of splitting.

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This happens approximately 7-10 days after ovulation, the blastocyst lodges onto the endometrium, and the endometrium lining binds onto the proteins on the trophoblast, which is what holds onto them for the rest of the pregnancy. The baby can now get nutrients and grow.

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As the blastocyst cells become more specialized, the gastrula is becoming more distinct, with the germ layers and extra embryonic membranes.

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This short clip gives a rife description of how stem cells become specialized cells.

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Gastrulation was the first part of morphogenesis due to the fact that it is the start of the different layers within in the cell. This is when the cell will start to develop its shape and form its characteristics. Morphogenesis controls the space of cells during embryo development in an organism. Differentiation occurs allowing cells to develop into a variety of structers.

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What is MORPHOGENESIS? What does MORPHOGENESIS mean? MORPHOGENESIS meaning & explanation

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The movement of cells after the blastocyst stage move into the gastrulation stage. Gastrulation forms the gastrula from the blastocyst. Formation of distinct germ layers.

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This is when the sperm penetrates the egg, fertilization has occurred. This occurs in the fallopian tubes.

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Follow us at: https://twitter.com/TutorVista Check us out at http://www.tutorvista.com/content/biology/biology-iii/angiosperm-morphology/fertilization.php Fertilization Fertilisation is the union of a human egg and sperm, usually occurring in the ampulla of the uterine tube. It is also the initiation of prenatal development. Scientists discovered the dynamics of human fertilisation in the nineteenth century.

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Forms during the seventh week of pregnancy. Transports blood with wastes to the placental wall and brings back blood with nutrients to the embryo. Made up of the allantois and yolk sac in the later weeks of pregnancy. Attaches the fetus to the placenta.

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Late cleavage, after the zygote has split resulting in 16 parts. Cell has not grown in size, just replicated DNA. Totipotent, can become any kind of cell. Day 2-4

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The placenta has chorionic villi. Only appears during pregnancy. No blood cells move across the membrane. This is where waste and nutrients exchanges. Waste goes to the placenta wall from fetus, and the placenta brings nutrients to the fetus. The placenta reaches the fetus through the umbilical cord. Through the umbilical cord they transfer nutrients, hormones, and wastes between fetus and mother.

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Now that morphogenesis has occurred, and the embryo is now a fetus (after 9 weeks), the fetus can now further its development in the womb.

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This is the stage where the hollow cave is present with all three germ layers. These layers will form the developing embryo. End of week one

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The yolk sac attaches to the embryo, this provides  nourishment to the embryo. Does not stay for the whole pregnancy. Usually is undetectable by week 20.

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Contributes to making up the placenta in the later weeks of pregnancy, along with the yolk sac and allantois. The chorion is the outer most membrane layer around the embryo, just outside the amnion.

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Forms the inner lining of the organs. Liver, pancreas, bladder and stomach.

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Covers the embryo/growing fetus to protect it. Filled with amniotic fluid. The inner most membrane, the chorion is just outside it.

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Inner cell mass, ICM, is a mass of cells above the ollow cavity in the blastocyst.

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Helps embryo get rid of liquid waste, exchange gases. The main function is to remove waste. This becomes the umbilical cord.

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After the morula stage, the cell gets a hollow cavity within. Now the cell is called a blastocyst. Day 5-7. Blastocyst differentiates.

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The embryo is surrounded by 3 extra embryonic membranes and a yolk sac. The three membranes are the amnion, chorion, allantois.

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There are three layers, the Ectoderm, Mesoderm, Endoderm.

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Develops inner organs which include the muscles, heart, bones and circulatory systems.

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A zygote is when a male and female gamete, sperm fertilizing the egg, result in the zygote. This is the first stage of cell division, before cell divides. This is early cleavage. Day 1

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Forms the exoskeleton, which is the hair, nails, mouth, skin and nasal cavity.

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Now that implantation has occurred, hCG hormone is released. Human chorionic gonadotropin (hCG) is a hormone produced by the placenta after implantation. This hormone is what will show a woman is pregnant as it will show up in her blood and urine after the implanted embryo releases the hormone. Also maintains the corpus luteum, so that it may release progesterone to thicken the cervix and maintain the endometrium for the embryo.