Occasionally, two primitive streaks form in one embryonic disk. Predictthe result. What happens if the two primitive streaks are touching eachother?

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: ''As development progresses, individual cellsbecome more and more restricted in the range of cell…

A: Cells are the basic unit of life. They are often known as "building blocks of the body" and exhibit…

Q: In a developing chicken embryo, what mesoderm lines the amniotic cavity?

A: The amnion, chorion, yolk sac, and allantois are the four extraembryonic membranes found in amniotes…

Q: ___________________ fluid protects the embryo from jarred movements and provides a watery…

A: The embryo inside the womb of the mother grows in a sac like bag called the amniotic sac.  It allows…

Q: Describe briefly amniocentesis and its purpose.

A: The process of fertilization includes a sperm (male gamete) fusing with an ovum (female egg). In…

Q: Which process occurs between the zygote and the embryo stage

A: Fertilization is the process of fusion of the male gamete and the female gamete, resulting in…

Q: Prevents implantation of an embryo.

A: IntraUterine Devices prevents implantation of an embryo. It hinders implantation.

Q: What is the embryonic sac?Which are the cells that formthe embryonic sac? What aretheir ploidies?

A: The angiosperms are vascular plants that produce flowers and fruits, and they belong to the phylum…

Q: Name two structures derived from each of the three embryonic tissue layers: endoderm, ectoderm, and…

A: Two structures derived from each of three embryonic tissue layers are : Endoderm  gives rise to…

Q: Which embryonic germ layer lines the outer surface of the embryo

A: An embryo is the early stage of human development in which organs form critical body structures.

Q: Parthenogenesis isa. the process by which the germ layers form.b. involved in the formation of the…

A: Reproduction is the process by which living beings produce their own kind.

Q: Indicating the name and respective ploidy of each involved cell how can theformation of egg cells…

A: the formation of egg cells from the germ cells occurs in the ovaries this process is known as…

Q: Differentiated Differentiated cells in a developing embryo derive from

A: The development of an embryo occurs in different layers. Every cell in the body have different…

Q: Why must animals be modifi ed in the embryo stage?

A: In this question, we will discuss the fundamentals of how humans have learned to manipulate genetic…

Q: In humans, implantation in the uterus occurs at whichstage of embryonic development?a. zygoteb.…

A: An embryo is an unborn offspring in the steps of development. It is part of the life cycle. It is…

Q: In a reptile egg, the extraembryonic membrane thatencloses the embryo in a watery environment is…

A: Answer is b.) amnion.

Q: What would happen if two sperm fertilized the same egg cell? If twosperm fertilized two egg cells?

A: Step 1 Fertilization and implantation is the process of fusion of two types of gametes (spermatozoa…

Q: If identical human twins develop from separate placentas, when must the embryo have separated? When…

A: Reproduction is the biological process through which the new individual organism is produced from…

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: Which structure connects the embryo to the placenta?

A: Umbilical cord

Q: ''In the early cleavage stages, when the embryocannot yet feed, the developmental program is driven…

A: The series of cell divisions that occur in a fertilized egg as it begins t develop into embryo is…

Q: What are embryonic stem (ES) cells ?

A: Stem cells are cells that are undifferentiated or "blank." This ensures they have the potential to…

Q: Identify the structures of an egg and a sperm that aredirectly involved in fertilization.

A: Fertilization is that the method by that the male and also the female gametes (sperms and therefore…

Q: Which tissues and structures develop from ectoderm? frommesoderm? from endoderm?

A: During organic process, 3 primary germed layers, called exoderm, endoderm, and endoderm are shaped…

Q: Describe the events that occur following fertilization ofthe oocyte and the process of implantation…

A: The menstrual cycle of a woman repeats itself every 28 days and consists of four phases namely the…

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: 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: Why are the ectoderm and endoderm called the “germ” layer?

A: Gastrulation is the process of the embryonic development in which cell  movements establish the…

Q: Newborns are at much higher risk for dehydration thanadults. Why?

A: A baby which is 2 months old from his or her birth is considered newborns.

Q: How many eggs are released by a human ovary in a month? How manyeggs do you think would have been…

A: The ovary is an organ present in the female reproductive system that produces an ovum (egg cell).…

Q: Is anther are bilobed if yes then why?

A: Plants are non-motile living beings that shows the capacity of producing their own food utilizing…

Q: In which type of animalsdoes the placenta exist? Whatis its main function?

A: The placenta is a large organ that develops during pregnancy. It is usually attached to the uterine…

Q: Ectodermal Derivatives of the Developing Chick Embryo   A. 33-hour Chick Embryo Transverse…

A: 1. Neural  is situated in the region of or on the same side of the body as the brain and spinal cord…

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: From which of the following is the embryo developed? Trophoblasts Inner cell mass Blastocoelen…

A: Embryo is formed from the  zygote and zygote is formed by the union of the male and female gametes.…

Q: During the evolution of animals , bilateral summetry accompanied cephalization . suggest a reason…

A: Evolution is the process by which an organism inherits or adapts favourable characteristics that…

Q: Explain the way in which the yolk amount affects the cleavage. Compare the Cleavage in a sea star…

A: Yolk  Yolk is a nutrient rich part of the egg which support the growth of developing embryo.

Q: How does amount of yolk affect cleavage? Compare cleavage in a sea star with that in a bird

A: Fertilization is the process of fusion between haploid male and female gametes to form diploid…

Q: What structures carry the egg from the ovaries to the uterus? Are these structures the same in all…

A: Introduction The ovary is a female reproductive organ that produces an egg called an ovum. This goes…

Q: Division of human egg is a) Holoblastic and equal b) Holoblastic and unequal c) Isoblastic d)…

A: Introduction - One of the largest cells in the human body is the human egg, or ovum. It is, however,…

Q: What is fertilized egg known as?

A: Fertilization When male gamete fuses with female gamete, this process is known as fertilization.

Q: The outermost (most superficial) extra embryonic membrane is____ a ) Allantois b ) Amnion d )…

A: Extraembryonic membrane are the membrane which is formed around the growing embryo and is involved…

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: The ectodermal layer in the fetus will develop into:

A: Correct answer: Nerve and Skin (first option)

Q: Where does the embryo get oxygen and release carbon dioxide? Hint: Where do vascular systems come…

A: From the given question, the given embryo is assumed to be bird’s embryo.The early stage of the…

Q: How can matter alone construct itself into the organized tissues of the embryo?

A: The embryo is the development stage in multicellular organisms. The development of the embryo begins…

Q: Fill in the blank:  The embryonic membrane that is attached to the edge of the embryonic disk and…

A: An embryonic membrane is a type of membrane that originates from the fertilized egg cell, and are…

Q: It appeared, then, that something in the region of the gray crescent was essential for proper…

A: The amphibian eggs, when divided into two blastomeres along the plane of first division, the cells…