Chapter 29 Human Development. TERMS: Embryology : the study of the fertilized egg’s development Events: When egg meets sperm this creates a zygote . In the first two months the zygote becomes an embryo , then is known as a fetus until birth
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NOTE: location of egg during fertilization
Fraternal twins are called Dizygotic twins- two different eggs and different sperm
Maybe different sex
as different as any other siblings
Identical (maternal) twins are called Monozygotic twins- same eggs and same sperm, the egg separates into two yokes
Always same sex? YES NO Why? Same genetic information is shared
Conjoined twins also called Siamese twins, the yokes didn’t separate totally
They are joined together and usually share body structureTwins
The umbilical cord is the blood vessels that connect mom to baby.
Mother and baby’s blood doesn’t mix
Through diffusion stuff gets in and out
Oxygen, diffuses from mom to baby and carbon dioxide diffuses from baby to momThe Umbilical Cord