1st structure developed in odontogenesis: a- Tom's process. b- Mantle dentin. c- Stomodeum. d- Tom's fiber. e- Non of above.

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: Aside from outer pinna, what structures do mammals have in their ears that reptiles and birds do…

A: * pinna  is absent in many mammals and  this organ acts as a heat dissipator but not involved in…

Q: Is the feather on the right side of the picture an adult male, adult female or juvenile? O Adult…

A: The presence of feathers in birds is their unique feature. Feathers provide insulation to birds and…

Q: 8. Name the two indicated structures below the arrow, seen here in the PinuS ovule.

A: Plants are majorly divided into 2 types they are vascular plants and on vascular plants. Non…

Q: 3.The blue arrow is pointing to the region called ?

A: We can say that Embryogenesis is defined as the type of sequential dynamic process where the embryo…

Q: The major organizing center of the gastrulating embryo is the A. Inner cell mass B. Primitive streak…

A: Note:- Sticking to our guidelines I have answered only ist three questions. Please ask rest of the…

Q: The experiment in which a second Zone of Polarizing Activity (ZPA) was transplanted to the anterior…

A: ZPA is a specialized zone or mesenchyme at the posterior part of the limb bud.

Q: Invagination of the sea urchin blastulaA. is preceded by changes in the shape of individual…

A: Invagination is a process occurring during gastrulation. It includes movement of cells at the…

Q: Meroblastic cleavage is typical of embryos formed from _______________ eggs. (a) moderately…

A: The egg is the vessel of the zygote, in which an embryo develops until it becomes mature enough to…

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: 4. Into what cavity does the blastopore open? The gastrular slit? What becomes of each? 5. Explain…

A: Introduction :  The initial gut that develops during the gastrula stage is called the archenteron.…

Q: Discuss all the processes involved in the development of the following organs: 1. Insect wing and…

A: The human body is considered to be comprised of different forms of organs responsible for performing…

Q: Gastrulation in a mammal would be most similar to gastrulation in a. a gecko. b. a tuna. c. an…

A: Gastrulation is a process of rearranging the cells of blastula (blastomere) into three germ layers…

Q: (A) Explain clearly the developmental and evolutionary significance of the neural crest within the…

A: Neural crest: it is found in vertebrates. Neural crest cells are derived from ectodermal layer of…

Q: During embryonic development, a neural crest would be found in all of the following chordates,…

A: Neural crest is a population of migratory cells which arise from the epithelial cells. It develops…

Q: Name specific structure "A" placenta Name specific structure "B" pedicel В A

A: The above picture shows an image of tomato which belong to angiosperm. It reproduces by sexual…

Q: Which of the following statement about the principles of teratology is NOT true? O a. Susceptibility…

A: Teratology is the study of abnormal physiological development or congenital abnormalities. The…

Q: what structure is the pointer pointing to? O Notochord what germ tissues are those structutres made…

A: There are different types of body structures, each specified for a particular function. These…

Q: Development of an animal is controlled by the genes that are expressed during development. What…

A: Hox genes are members of the homeotic transcription factor family that play a key role in…

Q: Which of the following are documented effects of Hox genes? Choose all that apply.  Group of answer…

A: Hox Genes are the homeotic genes which regulates the development of the specific body organs,…

Q: Which of these is mismatched?a. chorion—sense perceptionb. yolk sac—fi rst site of blood cell…

A: Animal development is the process in which a fertilized egg undergoes cell division and cellular…

Q: 1. Match the early embryo characteristics with the correct stage of development. Not all choices…

A: Embryology is a branch of science which deals with the study of embryo development. Embryology helps…

Q: Make a table to identify amle and female homologues and describe it common function. Minimum of 7…

A: Gender homologues are analogous or equivalent structures in males and females which perform the same…

Q: Arrange the following from first event to the last of odontogenesis   -DENTINOGENESIS  -AMELOGENESIS…

A: Introduction Odontogenesis:- It is the medical term used to describe the complex biological process…

Q: Define senescence. How would you measure senescence?  compare and contrast the two basic theories on…

A: The process of the growing old. In the  biology, the  senescence is a process by which the  cell…

Q: The formation of the neural plate is induced by the ….? Group of answer choices a. notochord b.…

A: The neural plate that has formed as a thickened plate from the ectoderm, which is induced by the…

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: LABEL THE PARTS OF THE DORSAL AND VENTRAL PARTS OF THE COCKROACH.

A: The cockroaches are under phylum arthropoda that contain paired joint appendages. The body is mainly…

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: In what ways do a bull’s reproductive organ structures differ from that of the human? How are the…

A: The reproductive system(male and female) is a complex system with a number of interconnected…

Q: Which of the following statements relating to axis formation in chickens is FALSE? a. Henson's node…

A: A) true- Henson's node secretes proteins that antagonize BMPs and that protein is named as…

Q: The zona pellucida is important in mammals because it...

A: The zona pellucida is a thick extracellular layer that covers all mammalian eggs and preimplantation…

Q: Which of the following is NOT a characteristic of avian axis formation?* a. The anterposterior axis…

A: 1. a. The anterposterior axis is established by a nodal cascadea. 2. b.follistatin

Q: All of the following are true about humans EXCEPT: A. our zygote and early embryo cells have…

A: Introduction :- A zygote is a eukaryotic cell created when two gametes fertilise each other. The…

Q: The brain develops froma. ectoderm.b. endoderm.c. mesoderm.

A: The central nervous system includes the brain and the spinal cord. It is the site of information…

Q: Describe two wats that the inernal anatomy of a fetal pig differs from that of a human

A: Anatomy is defined as the branch of science that studies the structure and organization of living…

Q: 7. Name the stage of development represented in the photo. 8. The blue arrow is pointing to the…

A: Embryogenesis or embryonic development is the process that explains the development of fertilized…

Q: extra-embryonic

A: An extraembryonic membrane is one in every one of the membranes which assist within the…

Q: The elephant and the crocodile evolved from a common ancestor. Which characteristic do they have in…

A: Elephant belongs to the class Mammalia and crocodile belong to the class reptilia. But there are…

Q: Which of the following describes the blastula development in frogs or anurans? Select the correct…

A: In  frogs , the cleavage is Holoblastic and unequal division with the mesolecithal egg .Here the…

Q: A. Describe the fundamental blueprint for the head. B. What are the Hox and Noggin genes? What role…

A: The head is present at the top of the human body. It supports the human face and is maintained by…

Q: 2. Which of the following Branchial arches ( Pharynge ches) leads to the developme mandible? a. Arch…

A: The branch the largest can be defined as the embryological structures that are developed to form the…

Q: Gonads and muscles of bilateral animals are derived from endoderm. True False

A: When fusion occurred between male amd female gametes and zygote is produced , it undergo certain…

Q: Can the dorsal lip of the blastopore inducecells in another part of the amphibian embryoto change…

A: The dorsal lip of a blastopore is a structure formed during the early development of the embryo. The…