Question regarding trimesters for biology class

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Science

Description

Outline the three major prenatal periods, describe the events associated with each, and explain how the three germ layers participate in the formation of extra-embryonic membranes. 

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Explanation & Answer

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Germinal Period: 1st 2 weeks of pregnancy. Zygote forms moves down the fallopian tubes. It then becomes a blastocyst and implants in the wall of the uterus.

Embryonic Period: Rapid cell division. The germ layers form. The blastocyst is now considered an embryo.

Fetal Period: Large increase in size. Maturation of body organs and systems.


Extra-embryonic membranes:

Yolk sac: consists of the endoderm and splanchnic mesoderm

Amnion: consists of the ectoderm and somatic mesoderm

The Chorio-Allantoic Membrane: consists of the ectoderm and somatic mesoderm

Please let me know if you need any clarification. I'm always happy to answer your questions.


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