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13-3 Development

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

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13-3 Development

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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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