BIOL207 Lecture Notes - Inner Cell Mass, Amniotic Sac, Trophoblast
11 Sep 2013
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Document Summary
Mitosis, meiosis, and life cycles con"t & chromosomes. When fertilization occurs, the pronuclei of both the sperm and the egg connect but do not fuse together. Pronucleus a gametic nucleus (of either gender) Humans hatch before being implanted into the uterine wall. The fluid-filled space between the placenta and the embryo is called the amniotic cavity. Here is a comparison chart that will be elaborated upon afterwards: An example in regards to the plant column: A diagram in regards to the fungi column: Dizygotic (fraternal: can have separate placenta and extra-embryonic membrane or a fused placenta and extra-embryonic membrane, a result of two separate eggs fertilized by different sperm. Monozygotic (identical: caused by separation of fertilized egg mass at the 2-cell stage or the splitting of inner cell mass. The later poses a risk for conjoined twins because the embryos share a common placenta and extra-embryonic membrane. End of mitosis, meiosis, and life cycles" lecture.
