The Smith County Veteran Services Office will be closed Monday through Monday, August 15-22, 2016. The Smith County Veterans Service Office will be closed Monday through Monday, August 15-22 for training, and will reopen on Tuesday, August 23 for normal business hours.
The first differentiation event in the formation of the placenta is the formation of trophoblasts, specialized epithelial cells, that ultimately form a physical connection between the embryo and the uterus. Allocation of cells to the trophoblast lineage is dependent on their position at the morula stage.
The Haploid Stage. The first structures in the haploid stage are the microspore and the megaspore. The microspore will develop into the male gametophyte and is much smaller than the female spore. The male gametophyte in angiosperms is the pollen and develops in the anther of the flower.