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.
Their flowers contain male and female reproductive organs that house spores,which will ultimately develop into the gametophytes. The gametophytes for angiosperms are pollen in the male structures and the embryo sac in the female ovary. The sperm in the pollen grains will fertilize the egg in the embryo sac and go onto produce a fertilized embryo and fruit.