Maximum DNA synthesis during the midproliferative phase of the cycle (i.e. cycle days 8â10) correlates with the maximum number of mitoses in both the stromal and epithelial endometrial cellular elements, as well as with the midproliferative peak of plasma estradiol and nuclear estradiol receptors.
Some defining characteristics of angiosperms include flowers, carpels, and the presence of endosperm, a nutritive substance found in seeds, produced via a second fertilization event. However, some current studies suggest that endosperm is not unique to angiosperms.
Fertilization is the process of fusion of the female gamete, the ovum or egg and the male gamete produced in the pollen tube by the pollen grain.Fertilization in flowering plants was discovered by Strassburger in 1884.Flowers are the reproductive structures of angiosperms. In the embryo sac, on the male nucleus fuses with the nucleus of the egg and forms a diploid zygote. 2  This process is known as true fertilization or syngamy. 3  The other male gamete or nucleus enters further into the embryo sac and it fuses with secondary nucleus.