Fetal Development

Complete the following table with the functions of each of the embryonic membranes: Embryonic Membrane Function Yolk sac   Chorion & Chorionic villi   Allantois   Amnion

After fertilization a developing embryos goes through several changes. At about 2-3 days, what is the embryo referred to as?

Which of the following does NOT aid the sperm in fertilization? * Increased mitochondria Cytoplasmic bridge Acrosomes Flagellum development Hyaluronidase & protease

Early Embryonic Development Match the following terms to the descriptor. NOTE: If you want to change your selection, you'll need to delete the one you already chose. After you delete it, the list of choices will pop back up and you can make a different choice. Organogenesis Hollow ball of cells Gastrulation Formation of organs Cleavage Rapid cell division Cells rearrange themselves into layers Blastula

Some Events in the Process of Fertilization 1. A single sperm nucleus and an egg nucleus fuse to form a zygote. 2. Many sperm cells travel a path through the outer layer of the egg cell. 3. The egg's plasma membrane is penetrated by a sperm cell. 4. A rapid depolarization of the egg plasma membrane occurs. The correct sequence to complete the fertilization of the egg is ,and

Why are the cell movements (i.e. invagination, involution, epiboly) important in proper development of the embryo?

Vertebrate Fertilized Class Blastula or Blastocyst Late Morula Gastrula Egg Embryo Amphibian Reptile Mammal How long after ovulation does it take an embryo to develop? The resulting embryo may become the (attached) in the lining of After eight weeks of development the embryo is called the How long does it takes the fetus to develop and grow inside the mother? What is differentiation? The embryo continues dividing and form all the tissues organs and organ systems of the animal When should pregnant mother take most precaution?

State and explain 5 effects of tobacco smoking by a pregnant mother on the foetus development. (400 words) Identify and explain 5 disadvantages of In vitro fertilisation (IVF) as an intervention to have a baby. (400 words) Why is breast feeding in the first 3month of a baby very important? (200 words) Higher animals undergo sexual reproduction despite its complexity, why. Give 5 reasons. (400 words) Describe five changes that occur in a flower after fertilisation. (200 words)

After the eighth week of development an embryos is referred to as what?

ARRANGE THE FOLLOWING EVENTS IN CORRECT SEQUENCE from 1-13: Penetration of the zona pellucida Cortical reaction 1st cleavage Acrosomal membranes rupture, and release their enzyme contents Penetration of the corona radiata Depolarization of egg membranes Migration of cortical cytoplasm to form gray crescent Sperm attach loosely on the zona pellucida Zona reaction Oocyte completes meiotic division    ZP3 tenaciously binds acrosome-intact sperm Release of Ca+2 in egg cytoplasm from its bound state Amphimixis

There are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction.  Egg-binding proteins on the sperm cell surface bind to molecules on the egg cell membrane. What happens to the chromosomes of the sperm and egg? The sperm cell membrane fuses with the egg plasma membrane, allowing the sperm nucleus and centriole to enter the egg cytoplasm. What is the purpose/role of the centriole during fertilization? The final event would be when the egg and sperm pronuclei migrate toward each other in preparation for syngamy. What is the purpose of reproduction?

Part IlI: Discussion 1. How can you distinguish an unfertilized egg from a fertilized egg? 2. As development proceeds from zygote to morula, what happens to the: a. number of cells? b. size of cells? C. size of the cell mass? 3. Construct a table listing the three germ layers of the gastrula and the major body portions formed from each Jayer. 108 Lab 33

From which of the following is the embryo developed? Trophoblasts Inner cell mass Blastocoelen The yellow sacks

Order the events leading to the sperm's nucleus fusing with the egg's nucleus.   Question 1 options:   sperm's nucleus is released into the egg's cytoplasm   sperm burrows through the orona radiata   sperm's nucleus and egg's nucleus fuse   sperm's cell memrbane fuses with egg's cell membrane   sperm's acrosome enzymes burrows through the zona pellucida   the zona pellucida changes so that any new sperm's acrosome cannot burrow through the zona pellucida

Name the four extra-embryonic membranes.

Anatomy and physiology

The chorion is the _____ and the amnion is the _____.

Draw and asnwer the blank spots

What are the phases displayed?

Which of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky cytoplasm to squeeze into animal pole Meiosis II completes Occurs before albumen and shell are secreted to cover the egg Cortical rotation Centrally located yolk confines cleavage to cytoplasmic rim of egg

from fertilization through week eight of development, a conceptus is specifically called a: embryo, zygote, fetus, or infant.?

How many layers does the embryonic disc consist of during the 3rd week of embryonic development Three layers Four layers O Two layers One layer

Fetus Inner Cell Mass Mesoderm Implantation Gastrulation Endoderm Zygote Embryo Ectoderm Blastocyst primitive germ (layers) Body Uterus Four implantation endometrium A. How does a human embryo form? Directions: Fill in the blanks below using the terms above. First, an unfertilized egg travels from the to the through the Multiple sperm traveling through the tubes will try to fertilize the egg. Once one of the sperm is successful, development begins. The divides into multiple cells on its way to the After about days, it forms a structure called a The cells inside the blastocyst, known as the will eventually develop into the and other supporting The outer cells of the blastocyst will develop into the tissues. begins when the blastocyst attaches to the Inner cell mass forms a disc, and the cells in the disc begin a process called First, some cells move inward, forming a groove on one side of the disc. This groove will determine the embryo's right-and-left body symmetry as it develops. As…

Which of the following is the latest stage of embryonic development (of this list)? blastula morula zygote 8 cell stage gastrula

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