When usingthe standard proteins it is typically assumed that the vv values of thestandard and actually measured protein are identical. With thisassumption, the ratio of the molecular masses of the two proteins isidentical to the ratio of their I(0)s normalized against the concen-trations.
The gametes (an egg and a sperm) fuse in the process of syngamy to form a 2 n zygote. The zygote divides mitotically to form a multicellular embryo ( embryogenesis), which is protected by either gametophytic tissues (such as remnants of archegonia in the nonseed land plants) or sporophytic tissues (the seed in the seed plants). An embryo,...
The zygote then divides progressively into a multi-cell embryo. When the embryo contains about 12-16 cells, it is called a morula. After 5-6 days, the embryo contains many cells and forms a cystic cavity termed the blastocoel within its center. At this stage, the embryo is called a blastocyst and has undergone the 1st step in differentiation; it separates into two tissue types, the trophectoderm and the inner cell mass. The trophectoderm is what is destined to become the placenta, while the inner cell mass eventually forms the fetus.