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.
Angiosperms, also called flowering plants, have seeds that are enclosed within an ovary (usually a fruit), while gymnosperms have no flowers or fruits, and have unenclosed or ânakedâ seeds on the surface of scales or leaves.Gymnosperm seeds are often configured as cones.ince gymnosperms and angiosperms are both vascular plants, they have a sporophyte-dominant life-cycle. Tissue formation in angiosperms exceeds the amount and complexity found in gymnosperms. Angiosperms have a triploid vascular tissue, flat leaves in numerous shapes and hardwood stems.