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Ch. 2 Heredity & Prenatal Development
Transcript of Ch. 2 Heredity & Prenatal Development
First three weeks
As a blastocyst, I quickly travel and grow. Eagerly making my way to my mommy's uterus. Here, I will attach myself to the lining of her uterus. I have finally found my first home.
Mom has formed a trophoblast layer and an embryoblast layer in one week! The trophoblast layer becomes the prenatal support tissue and the embryoblast layer forms into me.
Disturbances at this point cause major birth defects. Such as Down Syndrome or Ectopic Pregnancy.
Now that I am attached to the wall in mommy's uterus, I form a primitive streak. This happens within my bilateral disc.
The primitive streak is creating an identical right and left halves. I am now symmetrical!
Influence of Heredity on Development
*Extra chromosome in the 21st pair
*Extra x sex chromosome in males
*Females with single X chromosome
*poorly developed ovaries, short, and infertile
Environmental Influences on Prenatal Development
General Instructions for Expectant Mothers