The Pregnant Family-- Unit II-A Conception and Biophysical ...

2. Fertilization & implantation. a. process over time . Ovum (Fertilized Ovum (Zygote (Pronuclei Stage) (1st Mitotic Division (2-Cell Zygote (1 1/2 days later) (16-Cell Morula (3 days) (58-Cell Blastocyst (4 days) (107-Cell Unilaminar Blastocyst (4 1/2 days) (Several Days Pass Until Bilaminar Blastocyst Implants (6 days) b. double layer development ................
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