A fertilized egg, also called a________ , is a very large cell. One of the first events of animal development is the division of this cell, a process called______ , to produce a solid ball of much smaller cells, the_______. Soon, a cavity opens in this ball of cells, producing a hollow ball called the__________ . Movements of cells in this hollow ball during gastrulationproduce the three embryonic tissue layers, the______,________ , and________ .

Q: ......... is not developmental event in human and frog.   After fertilization rapid cycle of…

A: Fertilization is the event that marks the fusion of the female and male gamete which leads to the…

Q: A preembryo has:- a. A neural tube. b. A heart bulge. c. A cytotrophoblast. d. A coelom. e. decidual…

A: Cell denotes the primary structural and functional unit of all living organisms. Scientists…

Q: Spermatogenesis usually occurs during the ___________ and continues in the _________ stage in some…

A: * spermatogenis is the process of formation of sperm from germ cells in semniferous tubules of…

Q: Most of the skeletal system develops froma. ectoderm.b. endoderm.c. mesoderm.

A: Germ layer, any of three primary cell layers, formed in the earliest stages of embryonic…

Q: What two germ layers develop in the embryos of diploblastic animals? Check the two that apply.…

A: The two germ  layers of cells found in diploblastic animals are the outer ectoderm and the inner…

Q: Which of the following cell layers is not necessary to be considered a eumetazoan? a. Ectoderm…

A: Eumetazoans are the animals which are characterized by the presence of true tissues organized into…

Q: Choose the best of the following The identity of each segment of a developing embryo is…

A: the embryo is the structure formed by the division of zygote. it is the embryo that develops into an…

Q: Human development begins when cells are exposed to:   Question 12 options:   NODAL…

A:

Q: The cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently…

A: The term ‘reproduction’ is used for the process in which an offspring is produced from their…

Q: !) Consider the Spemann-Mangold organizer in amphibian development. Which of the -llowing statements…

A: The spemann-Mangold organizer helps in amphibian development.

Q: In mammals, the male gonad is called the______ . It produces both sperm and the sex hormone________…

A: Testes, the male gonads develop high in the abdominal cavity during the last two months or after…

Q: The Life Cycle of the Horse Embryo Process 2 Zygote Process Gametes Process 3 Reproductive organs…

A: The life cycle of a horse, like many other sexually reproducing organisms, involves a series of…

Q: What is the thickened dark linear band which appears caudally in the midline of the dorsum of…

A: Each vertebra in the vertebrate spinal column is an irregular bone with a complicated structure made…

Q: The _______ is an important structure for waste storage in birds and some mammals, but not in…

A: Extraembryonic membranes are the layers enclosing the embryo inside the uterus. There are four…

Q: The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the…

A: Cell is the basic unit of life. Based on the number of cells an organism may be prokaryotic or…

Q: For pattern formation to occur, the cells in the developing embryo must a. “know” their position…

A: The embryo formed after the fusion of the male and female gametes is the basis of the development of…

Q: Which of the following correctly identifies the stages in embryonic development between weeks 2 and…

A: Fertilization is a process in which haploid male gamete (sperm) fuses with the haploid female gamete…

Q: In insect embryonic development, the fertilized egg nucleus divides repeatedly giving rise to…

A: Embryonic development in insects The period of development of embryo starts at fertilization and at…

Q: Component of bilaminar germ disc: a.Hypoblast and endoderm b.Epiblast and hypoblast c.Epiblast and…

A: INTRODUCTION       In the inner cell mass the bilaminar embryonic disc may formed two layers of…

Q: Which of the following will result in identical twins?a. fertilization of two eggs by two different…

A: During fertilization, the sperm and egg recognize each other, the sperm fuses with the egg, joining…

Q: The embryonic diska. forms between the amniotic cavity and the yolk sac.b. contains the primitive…

A: The continuation of species in the world is due to the process of reproduction, either sexual or…

Q: Birds, reptiles and insects have something in common as far as the development of their embryos.…

A: Answer :- Birds, insects and reptiles are higher vertebrate . All of these are developed from…

Q: Blastocoel Visible nucleus O Archenteron Blastopore O Fertilization envelope

A: Formation of the fertilization membrane/fertilization envelop  The most important changes that…

Q: Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The…

A: The fusion and amalgamation of the male spermatozoa with the ovum of the female are the…

Q: after two weeks? Select one: Oa. First Three Days After Two Weeks Endometrium Amnion Ob. First Three…

A: Answer. Histologically, the uterus consists of three layers of tissue: Perimatrium, myometrium, and…

Q: Describe the four membranes in the avian egg. How does EACH membrane affect the developing embryo?

A: Avian egg development.

Q: Briefly summarize the main steps of animal development. What family of control genes plays a major…

A: Embryonic development, also known as "embryogenesis", is the process through which an embryo…

Q: Consider the variation in reproductive systems within the animal kingdom. These are discussed in the…

A: Refer to the solution

Q: During the creation of eggs, only one egg will be viable, the other 3 eventually break down. What…

A: Oogenesis is divided into three stages, which are the Multiplication phase, growth phase, and…

Q: Only one sperm enters an egg becausea. sperm have an acrosome.b. the corona radiata gets larger.c.…

A: Fertilization is a process in which male and female gametes fuse to form a zygote. This zygote…

Q: Which of the following is not derived from the ectoderm? a. adrenal medulla b. epidermis of skin c.…

A: The cell is known to be the fundamental unit of all life forms. Those who are similar in functions…

Q: Somites a. begin forming at the tail end of the embryo and then move forward in a wavelike…

A: Introduction: Somites can be defined as the longitudinal series among other series of blocklike…

Q: A sperm encounters an egg's jelly coat thus triggering the acrosomal reaction. What is the first…

A: Egg cells are the largest of all the cells in our body and are about 100 microns in diameter. It is…

Q: If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface…

A: The gastrula formation occurs during the early stage of cell development. During gastrulation the…

Q: By the end of gastrulation the [Select] * has surrounded the outside of the embryo, the [ Select ]…

A: Gastrulation refers to the process by which a gastrula is formed from a blastula. Grastrula is the…

Q: Which of these becomes the gastrointestinal tract? mesoderm endoderm ectoderm all of the above none…

A: The Gastrointestinal (GI) structures are the structure amidst the mouth and the anus.

Q: During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the…

A: The process during the development of the embryo where the folding of blastula on itself results in…

Q: A ball of cells that inside is full of cells is called?

A: Answer: The blastula is a hollow sphere of cells, referred to as blastomeres, surrounding an inner…