Which ONE of the following is NOT part of the pre-embryo?
Select one:
Maternal Determinants.
Cords of trophoblastic cells.
Pronucleus.
Blastomere.
Human Chorionic Gonadotropin.
Pre-embryo is the stage of the embryo just after fertilization. It lasts for first two weeks after fertilization.
Blastomeres, trophoblast cells, maternal determinants, HCG are all part of pre-embryo.
Once the pre-embryo settles in the endometrium HCG is formed.
Pro-nucleus is the nucleus of the sperm and ovum under going fertilization. Fertilization results in the formation of diploid zygote nucleus. So the pro-nucleus is absent in pre-embryo.
Right option is Pronucleus.
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