The cortical reaction of sea urchin eggs functionsdirectly in(A) the formation of a fertilization envelope.(B) the production of a fast block to polyspermy.(C) the generation of an electrical impulse bythe egg.(D) the fusion of egg and sperm nuclei

Q: Describe the movement of cells during early development that change an embryo from a blastula to a…

A: To describe: The movement of cells during early development that changes an embryo from a blastula…

Q: hy is it that the first trimester of pregnancy the most critical in humans? How will you relate it…

A: It is the early phase of pregnancy. The first trimester is marked as 1st day after your last period…

Q: What are three notable features between the fertilized and unfertilized egg?

A: Sperms and eggs are the gametes produced by male and female animals respectively in sexual…

Q: Which is theextraembryonic membranewhose function is to storenitrogen wastes of theembryo? Is this…

A: The membrane that is known to assist the developing embryo is known as an extraembryonic membrane.…

Q: What primary germ layer gives rise to the notochord? What is the function of the notochord?

A: Notochord It is a flexible, rod shaped body found in embryos of all chordates.

Q: What do you call the movement in which the yolk plug is formed in amphibians?

A: Introduction:- The residual patch of endodermal cells generated after the formation of the dorsal…

Q: What are the three typesof germ layers that formtissues and organs in animals?

A: The tissue is a group of cells that perform a specific function. Basically a group of cells who…

Q: Name the third tier of embryonal cells in pinus formed.

A: All plants come under the kingdom Plantae. They are eukaryotes, multicellular, and having cell…

Q: Describe the Gastrulation in Caenorhabditis elegans.

A: The study of embryo development is known as embryology. This covers the transformation of a…

Q: What aids in the differentiation or the maturation of the oogonium into a mature ovum?

A: Oogenesis is the process of formation of ovum. It occurs in ovary of female.

Q: How do the somites, intermediate mesoderm, and lateral plate mesoderm contribute to embryonic…

A: The early stages in the case of embryonic development start with fertilization. The fertilization…

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: Why are the offspring of a male and a hermaphrodite more variablethan the offspring of a…

A: Hermaphrodites in reproductive biology are organisms that have both male and female sex organs. For…

Q: List and describe the phases of embryonic development; from a zygote through gastrulation.  What…

A: Reproduction is the process of the formation of offspring from their parents. There are two modes of…

Q: Distinguish the structures of the female reproductive system that (a) produce the egg, (b) transport…

A: Sexual reproduction is a type of reproduction in which organism under goes different cycles like…

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: What are the cells producedin the first stage of theembryonic developmentcalled?

A: The process in which the embryo forms and develops is known as embryonic development.

Q: Why are sea urchins have external fertilization? What are the adaptive advantages of external…

A: Sea urchins are significant herbivores on coral reefs, & in certain environments they assume a…

Q: Contrast the number of sperm that are produced from oneprimary spermatocyte and the number of eggs…

A: Introduction  The life starts from single cell called Zygote. A zygote is formed by the fusion of…

Q: n the ventral surface of the embryo     series of tissue blocks lateral to the neural tube     a…

A: somures eventually differentiate into dermis, skeletal muscle, cartilage, tendons, and vertebrae.

Q: The ______ carries food and water to the developing zygote.

A: Nutrients are necessary for maintaining the growth of the embryo. In plants, the endosperm is the…

Q: Define chordamesoderm

A: Chordamesoderm is also known as axial mesoderm.

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: Label each tissue with the specific source germ cells: v Gastrointestinal tract A. Intermediate…

A: We are tripoblastic organisms that means we contains three types of germ layers that includes…

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: How are animals classifiedaccording to the germ layerspresent in their embryonicdevelopment?

A: Germ layers are developed during embryogenesis. They are programmed to develop specific organs,…

Q: What is the significance of gastrulation?

A: Gastrulation is the embryonic stage in which all the germinal layers are being developed. It is a…

Q: After the blastula stagewhat is the following stage ofthe embryonic development?What is the passage…

A: The process by which the embryo forms and develops is known as embryonic development. It includes…

Q: Which ovary is functional in birds?

A: Ovary is the female reproductive organ found in lower chordates to higher animals. Ovary produces…

Q: oviposition for

A: Oviposition is the process of expelling eggs from the oviduct to the external environment.

Q: Which layer is responsible for encasing the growing embryo?

A: An embryo is an early stage of development that is present in a multicellular organism. Embryonic…

Q: List and describe some developmental anomalies associated with gastrulation.

A: The term gastrulation basically address the early development of embryo from 1-D layer of epithelial…

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: n your own words: Expound how the mass of inert yolk influences gastrulation in amphibians,…

A: In evolutionary biology, evolutionary developmental biology is considered a new norm. It developed…

Q: Which embryonic germ layer lines the inner surface of the archenteron?

A: Germ layer can be seen in embryonic development in animal embryogenesis. It is the layer of cells.…

Q: What is the importance of sensory cephalization in animal survival?

A: Cephalization is the process in animals by which nervous and sensory tissues become concentrated in…

Q: A mammalian embryo puts the trophoblast into a hurried frenzy before it decides to proceed to the…

A: Trophoblasts refer to the cells that produce the external layer of a blastocyst. They can be seen…

Q: Regarding mammals, amphibians, and reptiles, explain thoroughly in what way does the inert yolk's…

A: Evolutionary developmental biology is considered a new norm in evolutionary biology. It arose from…

Q: From what the amnion of mammalian embryo is derived?

A: Amnion is an extraembryonic membrane also known as fetal membrane along with chorion, allantois, and…

Q: What is gastrulation? Howduring gastrulation are thefirst two germ layers formed?What are these germ…

A: Reproduction is the process of development of new offspring from the existing organisms. It is of…

Q: Concerning reproductionwhat is the function of thetesticles?

A: Introduction: Testicles are one of the male reproductive organs called as male gonads. These are…

Q: Define the function of fat body and kidney in frog reproductive system?

A: The excretory system and reproductive system of the frog are combined into 1 system which is called…

Q: How does the sperm reach upto egg and how does it enter into the egg?

A: Fertilization is the process in which a sperm and egg are fused together in the uterine tube of the…

Q: What are gonads? What arethe male and the femalegonads in humans?

A: Reproduction is the biological process by which new individual organisms – offspring, are produced…

Q: Draw an annotated diagram of the mammalian female reproductive system, making sure to label (name…

A: The female reproductive system presents various purposes. The ovaries provide the egg cells, named…

Q: Name two organ-system derivatives of each of the three germ layers.

A: A germ layer is a gathering of cells in an undeveloped organism that collaborate with one another as…

Q: How does the embryo turnfrom gastrula into neurula?How is the neural tubeformed? What is…

A: The gestation is period refers to the time during which zygote develops to the foetus. The gestation…