Question regarding trimesters for biology class

timer Asked: Dec 6th, 2015
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Question 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. 

Tutor Answer

Brad B555
School: Boston College

Thank you for the opportunity to help you with your question!

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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Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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