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Wednesday March 3rd's notes

by: Gabi Reed

Wednesday March 3rd's notes bio 254

Marketplace > Ball State University > Biology > bio 254 > Wednesday March 3rd s notes
Gabi Reed

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About this Document

Missed Monday, but here is Wednesday's notes. Don't forget about the homework due by 3 o'clock Friday, no class, have a fun Spring Break!
Biology in the Social Context
Dr. Rogers
Class Notes
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This 2 page Class Notes was uploaded by Gabi Reed on Wednesday March 2, 2016. The Class Notes belongs to bio 254 at Ball State University taught by Dr. Rogers in Spring 2016. Since its upload, it has received 10 views. For similar materials see Biology in the Social Context in Biology at Ball State University.


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Date Created: 03/02/16
Prenatal Testing First Visit Blood Test Blood Type Glucose (Sugar Level) Iron Levels STDs Triple Test Blood Test Usually done between weeks 15-20 hCG (human chrionic gonadotropin AFP (alpha feto-protein) Estroil (a form of estrogen) Screening Test- gives a lot of false positives, but you want negatives, positives mean more testing Identical Twins 1 egg and 1 sperm Same Placenta Separate Amniotic sacs Blastocyst (5 days old) and inner cell mass (embryo) Most common way of twins= Inner cell mass splits in two Sperm fertilizes egg and get a zygote. In the splitting of cells, the cells split and each acts as an individual zygote Conjoined twins form when the cell masses split and they have a bridge. Non-Identical Twins (Fraternal) 2 eggs and 2 sperms Two Placentas Fetus in Fetu A twin starts to form but is absorbed into the other and never fully forms. Placenta Amnion and Chorion Ultrasound Harmless sound waves bounce off inner tissues and give an image to a computer. Amniocentesis Only done if something is suspected to be wrong Goes into the Amniotic sac with a needle and get cells Done around week 15 Amnio can detect around 400 different conditions Chorionic Villus Sampling Tests cells in the chorion Made of embryonic cells. Are exactly like the cells of the baby


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