Making Babies III: Early Development and Implantation Video Lessons

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Problem: Embryonic DevelopmentAfter fertilization, embryonic development progresses through three stages:1. cleavage, during which the zygote develops into a blastula through extensive cell division;2. gastrulation, during which three tissue layers are established by the dramatic rearrangement of cells, forming a gastrula;3. organogenesis, during which the rudiments of organs develop.The details of embryonic development vary by species, but the developmental sequence is consistent. Embryonic development has been studied extensively in a few species, including sea urchins, frogs, and chickens. All the images in this tutorial are based on frog development.Determine which terms, phrases, and images describe each phase of development.

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Cleavage: zygote undergoes multiple cell division with no significant growth → cytoplasm is partitioned to several cells

• Formation of a blastula


Gastrulation: establishment of embryonic germ layers

• Formation of a gastrula

Blastopore is differentiated → becomes either the mouth or anus

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Problem Details

Embryonic Development

After fertilization, embryonic development progresses through three stages:

1. cleavage, during which the zygote develops into a blastula through extensive cell division;

2. gastrulation, during which three tissue layers are established by the dramatic rearrangement of cells, forming a gastrula;

3. organogenesis, during which the rudiments of organs develop.

The details of embryonic development vary by species, but the developmental sequence is consistent. Embryonic development has been studied extensively in a few species, including sea urchins, frogs, and chickens. All the images in this tutorial are based on frog development.

Determine which terms, phrases, and images describe each phase of development.




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