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Embryonic Development: From Zygote to Fetus

Understand the stages of human development from fertilization to organ formation. Explore topics like cleavage, implantation, differentiation, and gastrulation. Learn how genes influence cell specialization in the blastocyst. Get ready for quizzes on reproductive structures and the menstrual cycle. Required lab packet for Making Connections Lab. Enhance your knowledge of the miraculous journey from a single cell to a complex organism.

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Embryonic Development: From Zygote to Fetus

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  1. 13-3 Development Aim: How do humans develop from a zygote to a fetus?

  2. A) Fertilization • Fertilization may occur within a few days of ovulation • The fusion of the sperm nucleus and the egg nucleus result in a diploid zygote. • Fertilization occurs in the _______________.

  3. B) Cleavage and Implantation • In the first week after fertilization, the zygote undergoes a series of mitotic divisions known as cleavage. • Cleavage produces many smaller cells within the zygote.

  4. Cleavage continues as the zygote moves through the Fallopian tube toward the uterus. When the zygote is a solid ball of cells, it is called a morula. • By the time it reaches the uterus, the zygote is a hollow ball of cells called the blastocyst. • The blastocyst attaches itself to the lining of the uterus in an event called implantation.

  5. C) Differentiation • Once the blastocyst has been implanted into the uterus, differentiation occurs. • Differentiation (also called spcialization) is when the cells of the blastocyst develop into the various types of tissues in the body.

  6. What causes differentiation to occur? • Differentiation is caused by the activation of certain genes.

  7. D) Gastrulation • The next stage of development is gastrulation. • During gastrulation, three distinct cell layers form. • The ectoderm • The mesoderm • The endoderm

  8. Development of Organs and Organ Systems

  9. REMINDERS: • Quiz tomorrow on the male and female reproductive structure. You must be able to identify the structures and give me their functions. • Quiz on Wednesday on the Menstrual Cycle. • For lab this cycle you must print up the MAKING CONNECTIONS LAB STUDENT LABORATORY PACKET.

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