Somites a. begin forming at the tail end of the embryo and then move forward in a wavelike fashion. b. are derived from endoderm. c. develop into only one type of tissue per somite. d. may vary in number from one species to the next.
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: 1. Summarize the events that occur from the fertilization to the development of an embryo. In plants…
A: Note: Please upload 2nd question separately. Answer: Introduction: Fertilization is mixture of…
Q: If an egg cell were treated with EDTA, a chemical that bindscalcium and magnesium ions,(A) the…
A: EDTA - Ethelene diamine tetra acetic acid is a chelating agent and is very effective chelator of…
Q: Fill in the blank: The cell resulting from fertilization is called a(an) ___________________.
A: The gametes are present in both males and females. These are the haploid cells that are required for…
Q: Double fertilization means that(A) flowers must be pollinated twice to yield fruits and seeds.(B)…
A: In plants and in animals, sexual reproduction is the process of making new individuals. In sexual…
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: The formation of three germ layers is called Select one: a. gastrulation b. pluripotency c.…
A: A zygote is the fertilized egg that is formed by the fusion of the egg and the sperm via the process…
Q: Which developmental stage is mismatched? a. second week—implantation b. third week—heart development…
A: Option D is mis Matched
Q: External fertilization occurs in which type of environment? a. aquatic b. forested c. savanna d.…
A: “External Fertilization” is a process of reproduction in which the “male gamete” (sperm) and the…
Q: The Following are parts of sperm cell, what their importance in fertilization? A. Acrosomal Vesicle…
A: The Following are parts of sperm cell, what their importance in fertilization? A. Acrosomal Vesicle…
Q: Which of the following is develops into the archenteron? A. the placenta B. the endoderm C. the…
A: Placenta is an organ which helps in providing oxygen and nutrients to growing baby and removal of…
Q: Somites, in the embryo, give rise to muscle. Is the statement above true or false?
A: Somites are found around neural tubes in the embryonic stage of a vertebrate. Somites are made up of…
Q: A human is a complex organism that develops from a zygote. Briefly explain some of the the steps in…
A: Reproduction is the process by which organisms multiply through sexual and asexual modes. It is one…
Q: The outermost germ layer in a vertebrate gastrula is the____ . a. endoderm c. mesoderm b. ectoderm…
A: BASIC INFORMATION FERTILIZATION It is the process of the fusion of the male as well as the female…
Q: Match the germ layer with the correct derivative Gastrodermis v [ Choose ] Ectoderm Endoderm…
A: There are 3 germ layers ectoderm, mesoderm and endoderm giving rise to different organs in…
Q: In animals, a key difference between spermatogenesis andoogenesis is thata. only oogenesis involves…
A: Reproduction refer to a biological process in which new organisms are produced from their parents.…
Q: which germ layer (tissue) gives rice to our nervous system and outer coverings. a) endotherm b)…
A: The mesoderm, or middle tissue, gives rise to most of the muscle and connective tissues. Finally the…
Q: Which of the following extra-embyonic membranes become the embryonic portion of the structure…
A:
Q: Which of the following statements about gastrulation is correct? A. During gastrulation, the…
A: The embryonic development after 15 days of fertilization marks gastrulation.
Q: . In humans, identical twins are possible because(A) extraembryonic cells interact with the zygote…
A: The identical twins are also referred to as monozygotic twins. This occurs from the fertilization of…
Q: 4. Sarcomas and hematopoietic cancers are both derived from which germ layer? A. Ectoderm B.…
A: "Cancer" is a fatal disease that has both physical and mental consequences for a person. Cancer can…
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: A A Mesoderm Ectoderm Endoderm In the above diagram, there is an opening that has appeared on the…
A: Developmental biology is the study of the process by which organisms grow and develop.
Q: After fertilization a developing embryos goes through several changes. At about 2-3 days, what is…
A: During fertilization the haploid gametes, that is, sperm from a male and secondary oocyte from…
Q: A) The correct order of chronological order of developmental events is a. 1.cleavage 2.…
A: Since you have asked two questions, we would be answering only the first. Post the second question…
Q: The cortical reaction of sea urchin eggs functionsdirectly in(A) the formation of a fertilization…
A: Sea urchins are the globular animals that belong to the class Echinoidea. They come under the…
Q: Which of the following is not true about neurulation? Choose all possible answers. a. Segregation…
A: The brain is a complex organ that controls the thought, memory, emotion, touch, motor skills,…
Q: Which mechanism prevents an ovum from being fertilized by multiple sperm cells? A. Once a sperm…
A: An egg should be prepared by only one sperm in particular. To forestall polyspermy, the zona…
Q: Illustrate an egg in early cleavage, distinguish this stage from thise that follow (2,4,8 cell…
A: In developmental biology, several stages are there which determines the development of the fetus…
Q: Fertilization: a) Briefly describe the process of fertilization in humans, b) identifying key…
A: Sexual reproduction is the process by which new young ones are produced, by fusion of the genetic…
Q: What is NOT true about embryo development? A. a morula is an earlier stage than a gastrula B.…
A: Zygote is a structure formed by the fusion of male and female gamete. The stage of development of…
Q: a. development of organs
A: 1. Development of organs
Q: Which statement relating to frog gastrulation is INCORRECT? a. A second set of bottle cells…
A: Embryonic development refers to the division in zygote and growth that ultimately goes through…
Q: Which of the following statements is TRUE? A. Animals with indirect development requires external…
A: Correct option is C. Parthenogenesis is a form of sexual reproduction Parthenogenesis is commonly…
Q: A change in the amount of yolk and its distribution in the egg will affect: A Fertilization…
A: Fertilization is the fusion of haploid male and female gamete results in the formation of the…
Q: During morphogenesis, gastrulation does which of the following? A. Gastrulation produces the…
A: Several stages are involved in the development of a baby from a zygote during pregnancy. It begins…
Q: The embryos of complex multicellular animals must establish spatial coordinates if development is to…
A: To find The reference coordinate for developing frogs for the development to proceed
Q: observe that your drug-treated embryo is than an untreated control fertilized at the same time
A: Mitosis is a type of cell division which take place in body cells. Mitosis is a way of making more…
Q: The Embryonic stem cells can be derived from _______ which is developed by “invitro…
A: The egg cell fuses with the sperm cell to form the zygote. The zygote develops into an embryo where…
Q: After the eighth week of development an embryos is referred to as what?
A: After the 8th week of development, the embryo is referred to as "fetus"
Q: Cells transplanted from the neural tube of a frog embryo to theventral part of another embryo…
A: Neural tube of a frog embryo is a tube which acts as an embryonic precursor to the central nervous…
Q: atch the germ layer on the right with its contribution to the tissues and organs of the embryo, on…
A: Endoderm, ectoderm, and mesoderm are the three germ layer types. Tissues and embryonic organs…
Q: A: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea…
A: Introduction: We’ll answer the first question since the exact one wasn’t specified. Please submit a…
Q: A. What are the cell movements (ex. Epiboly, involution, etc.) involved in human gastrulation?…
A: Gastrulation is the stage in embryogenesis where three germ layers are formed.
| Somites |
| a. begin forming at the tail end of the embryo and then move forward in a wavelike fashion. |
| b. are derived from endoderm. |
| c. develop into only one type of tissue per somite. |
| d. may vary in number from one species to the next. |
Step by step
Solved in 2 steps
- What are the significance of ORGATOGENESIS. State whether it is a normal developmental phenomena or not, support your answer.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)The evolution / development of the skeletal system of the vertebrate is an example of the process of cellular specialization. This refers to the fact? a) all the ectoderm cells remain the same b) the cells derived from the endoderm to form osteocytes that secrete collagen c) the cells of the endoderm form chondrocytes that become notochord d) genes are activated or surpressed in the cells from the original mesoderm causing them to become chondrocytes and osteocytes the stem cells that sequentially produce the componets of the skeleton e) genes are not involved in this function?
- Problem:Fetal development takes place in a relatively short amount of time. In just nine months, a functioning human being develops from a zygote formed from the joining of an egg and a sperm. During that time, the fetus receives from its mother through the placenta and umbilical cord everything that it needs to grow and develop into a baby. Form a Hypothesis: Develop an explanation for how a woman’s lifestyle choices affect the substances that enter the fetus. (In paragraph form)Epithelium–Mesenchyme transitions (MET or EMT) are crucial morphogenetic events occurring during gastrulation. Give at least 3 specific examples of embryonic structures that develop in this manner, and the regulatory mechanisms that govern this transition.Organ rudiments of the 72-hr chick embryo and their functions organ rudiment identity function A B C D E
- Which statements are true? Explain why or why not.1 In the early cleavage stages, when the embryocannot yet feed, the developmental program is driven andcontrolled entirely by the material deposited in the egg bythe mother.2 Because of the many later developmental trans-formations that produce the elaborately structured organs,the body plan set up during gastrulation bears little resem-blance to the body plan in the adult.3 As development progresses, individual cellsbecome more and more restricted in the range of cell typesthey can give rise to.4 At different stages of embryonic development,the same signals are used over and over again by differentcells, but with different biological outcomes.5 Changes in the coding regions of genes involved indevelopment are primarily responsible for the differencesbetween species. 6 The cell cycle is the ticking clock that sets thetempo of developmental processes, with maturationalchanges in gene expression being dependent on cell-cycleprogression.T.S. of mammalian testis revealing seminiferous tubules show different types of cell.(i) Name the two types of cells of germinal epithelium.(ii) Name of cells scattered in connective tissue and lying between seminiferous tubules.Differentiate between them on the basis of their functions.Component of bilaminar germ disc: a.Hypoblast and endoderm b.Epiblast and hypoblast c.Epiblast and ectoderm d.Ectoderm and mesoderm
- Reproductive physiology (human) a) At the time of ovulation, the released ovum (egg) has completed both meiosis I and meiosis II. b) Because the corpus luteum (CL) is rescued from atresia by hCG early in pregnancy, the CL continues to produce progesterone throughout the 9 months of a normal pregnancy. c) Late in the follicular phase, estrogen participates in a positive feedback loop that leads to a surge in luteinizing hormone and ovulation. d) Both (a) and (b) are correct and (c) is incorrect e) Statements (a), (b) and (c) are all correctIn adults, new connective tissue cells originate from the________.a. mesodermb. mesenchymec. ectodermd. endodermA 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________ .