Question 10 of 20 50 50 Points What interdependent processes are involved in the. ... Course Title SCIN 402; Type. Homework Help. Uploaded By mhine13; Pages 9 Ratings 100% (47) 47 out of 47 people found this document helpful; This preview shows page 4 - 6 out of 9 pages. ...
Apr 24, 2019 · Each embryo starts development as a zygote, a single cell resulting from the fusion of gametes (i.e. the process of fertilization which is the fusion of a female egg cell and a male sperm cell). In the first stages of embryonic development, a single-celled zygote undergoes many rapid cell divisions, called cleavage, to form a blastula, which looks similar to a ball of cells.
Development Developmental biology is the study of the process by which organisms grow and develop. Modern developmental biology studies the genetic control of cell growth, differentiation and morphogenesis, which is the process that gives rise to tissues, organs and anatomy. Embryology is a branch of biology dealing with embryos and their development.it is the study …
Inner layer is a solid mass of call Outer later of the morula Trophoblast Endometrium now called Decidua, uterine layer involved in implantation Sequence of development of fertilized ovum : Zygote, morula, blastocyte, trophoblast, embro, fetus. ( zebras monkey bears talk every Friday )
Transport of the Fertilized Ovum in the Fallopian Tube. After fertilization has occurred, an additional 3 to 5 days is normally required for transport of the fertilized ovum through the remainder of the fallopian tube into the cavity of the uterus (Figure 82–2).
While still in the ovary, the ovum is in the primary oocyte stage. Shortly before it is released from the ovarian follicle, its nucleus divides by meiosis and a firstpolar body is expelled from the nucleus of the oocyte. The primary oocyte thenbecomes the secondary oocyte.
But before a sperm can enter the ovum, it must first pene-trate the multiple layers of granulosa cells attached to the outside of the ovum (the corona radiata) and then bind to and penetrate the zona pellucida surrounding the ovum itself. Once a sperm has entered the ovum (which is still in the secondary oocyte stage of development), ...
This leaves 23 unpaired chromosomes in the secondary oocyte. It is at this time that the ovum, still in the secondary oocyte stage, is ovulated into the abdominal cavity. Then, almost immediately, it enters the fimbriated end of one of the fallopian tubes. Entry of the Ovum into the Fallopian Tube (Oviduct).
The mature ovum still carries in its nucleus (now called the femalepronucleus) 23 chromosomes. One of these chromo-somes is the female chromosome, known as the Xchromosome. `In the meantime, the fertilizing sperm has also changed. On entering the ovum, its head swells to form a male pronucleus, shown in Figure 82–1D.
Before implantation, the blastocyst obtains its nutrition from the uterine endometrial secretions, called “uterine milk.”. Implantation results from the action of trophoblastcells that develop over the surface of the blastocyst.These cells secrete proteolytic enzymes that digest and liquefy the adjacent cells of the uterine endometrium.
This delayed transport of the fertilized ovum through the fallopian tube allows several stages of cell division to occur before the dividing ovum—now called a blastocyst, with about 100 cells—enters the uterus.