All of the cell types of an adult vertebrate develop from three primary embryonic germ cell layers, e.g. skin epithelium originates from ____ and intestinal epithelium from ____. A)ectoderm, endoderm B)ectoderm; ectoderm C)endoderm; endoderm D)endoderm; ectoderm

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) Exhibit a rotational holoblastic cleavage b) During the second division, the dorsal-ventral axis…

A: C. Elegans is a nematode. The C. elegans life cycle comprises of four larval stages L1, L2, L3, L4…

Q: The point mutation in the Bone Morphogenetic Protein receptor 1B (BMPR-1B) appears to have no…

A: The Bone Morphogenetic Protein receptor 1B (BMPR-1B) is a gene that encodes a transmembrane receptor…

Q: Compare and contrast between the following: (1) Medio-lateral intercalation and radial…

A: The layers of a human embryo, from innermost to outermost, are the endoderm, mesoderm, and ectoderm.…

Q: What exactly is the zona pellucida? Does it make up the plasma membrane, vitelline layer, AND jelly…

A: Introduction  The extracellular matrix, also known as the ECM, is a three-dimensional network of…

Q: Why is a second polar body expelled after fertilisation?   a)   To remove excess cytoplasm   b)…

A: The second polar body is a small, non-functional cell that is produced during oogenesis after the…

Q: Write in detail the process of organogenesis in vertebrates. Give one example and make diagram also.

A: In embryology, Organogenesis can be described as a series of processes that lead to converting the…

Q: Which of the following has three germ layers? (a) morula  (b) gastrula (c) blastula (d) blastocyst…

A: Answer is b.)  gastrula.

Q: Draw the amphibian and avian unfertilized eggs. Label membrane coverings and orientation of…

A: Unfertilized eggs are the eggs that have not been fertilized by sperm.

Q: Explain the Tissue Stages of Development under Early Stages of Animal Development ?

A: The embryo in an animal develops, the cells start to divide, grow, and transfer in specific patterns…

Q: 3. During the course of successful prenatal development, a human organism begins as a(n): A) Zygote…

A: The goal of developmental biology is to comprehend how an organism develops—how a single cell…

Q: Nematocysts are  a.) reproductive cells b.)excretory organs c.) set of muscle cells d.)…

A: Answer  (e). Defensive cells

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: The muscular system develops from which embryonic germ layer? a) Ectoderm B) Mesoderm D) Endoderm

A: The human muscular system is responsible for the movement of the human body. It is made up of over…

Q: Which of the following rows correctly identifies the development of the germ layers? Select one:…

A: The germ layers are an embryonic collection of cells that aid in the creation and development of…

Q: Name the three embryonic tissue layers of vertebrate embryos,and describe the process by which they…

A: Gastrulation is the cycle where differentiated cells from the zygote move to their particular areas.…

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

A: Avian egg development.

Q: In Deuterostomes, nutrient molecules (monomers) are taken in to the space between the endoderm and…

A: Option (a) is incorrect because, in Deuterostomes, nutrient molecules (monomers) are taken up into…

Q: The fast block to polyspermy in sea urchins (a) is a depolarization of the egg plasma membrane (b)…

A: The egg's blocks to polyspermy (fertilization of an egg by more than one sperm) were originally…

Q: 6. A male newborn has renal agenesis on the right. Which of the following primitive rudiments most…

A: Introduction:-  Renal agenesis is a rare condition in which one or both kidney are not present in…

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

A: Refer to the solution

Q: THE FATE OF THE 1ST OPENING IN THE PROTOSOMES AND THE 2ND OPENING IN THE DEUTEROSTOMES IS DETERMINED…

A: Introduction  During their embryonic development, animals belonging to the clade of protostomes…

Q: What's the process of gastrulation in humans, how the embryo forms the three germ layers, and which…

A: The inner cell mass which is known as Blastula is now grown into a cell mass known  Gastrula and…

Q: What mechanisms have evolved in animals with(a) external fertilization and (b) internal…

A: The process that involves fusion of the male and female gametes namely sperm and ovum respectively…

Q: If Ca2+ from the egg’s endoplasmic reticulum is responsible for the cortical granule reaction and…

A: Reproduction is the process of production of own kinds.

Q: Which of the following type of placenta is found in humans? a) Discoidal b) Zonary c) Diffuse d)…

A: Introduction - During the pregnancy phase, the placenta is an organ that grows inside the uterus. A…

Q: In identifying the marginal cells of the tunicate embryo, which of the following is the role of the…

A: The seas squirts are examples of tunicates which are a type of invertebrates found in Marine…

Q: The opening between the two atria is found in a placental mammal fetus is called the:

A: The heart is the most vital organ of the body in biological organisms that works continuously from…

Q: Explain the following terms: ectoderm, endoderm, mesoderm and stem.

A: Animal phylogeny is a rapidly changing field. The biologists mostly depend on the fossils to compare…

Q: According to the film, "Your inner reptile," which of the following did we inherit from our…

A: The question is asking us to identify which traits we, as humans, have inherited from our reptilian…

Q: Pathway (in order) of the following in the frog: a. urine b. egg cells c. sperm cells

A: Introduction :- In sexual reproduction, sperm is the male reproductive cell, or gamete (forms in…

Q: The notochord develops primarily from (a) ectoderm, (b) neural crest, (c) mesoderm, (d) endoderm.

A: The process of embryonic development that begins at the end of gastrulation and lasts until birth is…

Q: In the cnidaria the ectoderm cells are important because they can react to a stimulus (light) from…

A: Cnidaria possess two layers, endoderm and ectoderm. The gastrodermis, or inner lining, is formed by…

Q: 299. A 3 month infant is brought to the physician because of an upper respiratory tract infection.…

A: Case summary patient is a 3 month infant with upper respiratory tract infection. Complaint of…

Q: ferent class

A: Introduction  Creatures having a place with class Mammalia are alluded to as warm blooded animals.…

Q: Differentiate between human skin cell and human ovum.

A: Cell is a basic membrane-bound unit and it is often called as the basic building blocks of all…

Q: Explain the concept of negative feedback using the male reproductive hormones (hormonal control of…

A: As per the guidelines we are supposed to answer only the first question in case of multiple question…

Q: 4. The muscular system develops from which embryonic germ layer? a ) Ectoderm B ) Mesoderm D )…

A: During the crucial stage of gestation, known as gastrulation, the pluripotent stem cells…

Q: Which of the following embryonic structures are segmented? (More than one is correct.) (a)…

A: There are three basic embryonic structures and four embryonic membrane supports the growing embryo…

Q: 10 @ 2 # 3 Question 6 During the start of the third week of development, numerous lacunae appear in…

A: The question is asking about the location of the primary extraembryonic mesodermal reticulum during…

Q: What four types of cellular processes must occur to enable a fertilized egg to develop into an adult…

A: Pattern development is the cycle by which a particular cell, the treated egg, partitions to offer…

Q: The circulatory system of the vertebrates is derived from    ?    of the Cnideria: a) ectoderm, b)…

A: The circulatory system, also known as the cardiovascular system, is the organ system that allows the…