......... is not developmental event in human and frog.   After fertilization rapid cycle of mitosis occurs  formation of mesoderm,ecto and endoderm formation of placenta from trophoblast large cellular movement during gastrulation

Q: Have you ever watched an old movie or television show where the expression “the rabbit died” meant…

A: Introduction: In the year 1931, an early pregnancy test named the rabbit test was developed by…

Q: +Describe the process of implantation of the embryo, what cells are involved and their roles.…

A: Implantation is the process where the blastocyst attaches to the endometrium of the uterine cavity.…

Q: At which embryonic event would one be able to first distinguish a diploblastic embryo from a…

A: Answer: In reproduction process after the fertilization of female egg cell with sperm male cell…

Q: Milk production in the mammary glands is stimulated by a hormone from the pituitary gland…

A: Pituitary gland is a small pink coloured gland. Morphologically pituitary has three parts namely…

Q: Describe the process of mammalian and avian gastrulation

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A: These questions are related to embryology and lactation. I will answer all three in next step along…

Q: 3. (a) What are the four processes that drive embryonic development? (b) What two processes drive…

A: Embryonic development involves the stages of development from formation of a single celled zygote…

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: 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: The development of sex and gender is a good example of a developmental cascade because:   Group of…

A: Developmental Cascade:  Developmental cascades refer to collective influences on the development of…

Q: If the whole ectoderm is exposed to high levels of BMP activity, which of the following ectodermal…

A: The succession of significant biological changes linked with growth, information transmission, and…

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: Component of bilaminar germ disc: a.Hypoblast and endoderm b.Epiblast and hypoblast c.Epiblast and…

A: INTRODUCTION       In the inner cell mass the bilaminar embryonic disc may formed two layers of…

Q: -3. The figure below shows cleavage stages in an embryo. From studying the photographs, what can you…

A: On fertilization, the zygote undergoes cleavage. That is the process of development of multicellular…

Q: Which of the following is not an extraembryonic membrane?a. amnionb. mesodermc. choriond. yolk sac

A: The embryo is an initial development phase of the eukaryotic organism following the egg…

Q: Birds, reptiles and insects have something in common as far as the development of their embryos.…

A: Answer :- Birds, insects and reptiles are higher vertebrate . All of these are developed from…

Q: Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The…

A: The fusion and amalgamation of the male spermatozoa with the ovum of the female are the…

Q: Endoderm Mesoderm Ectoderm Match the structures below with the correct germ layers listed above…

A: The germ layer: The primary layer of cells. It is formed during embryonal development. The…

Q: A fertilized egg, also called a________ , is a very large cell. One of the first events of animal…

A: Answers are :   A fertilized egg, also called a zygote, is a very large cell. One of the first…

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: after two weeks? Select one: Oa. First Three Days After Two Weeks Endometrium Amnion Ob. First Three…

A: Answer. Histologically, the uterus consists of three layers of tissue: Perimatrium, myometrium, and…

Q: The placentaa. develops from the trophoblast.b. allows maternal blood to mix with embryonic blood.c.…

A: After fertilization of the zygote, the cell begins to divide, forming the blastocyst. It is at the…

Q: 10. Draw and label a 14-day conceptus showing the chorionic sac, the chorionic cavity. Be sure and…

A: During the early stages of embryonic development, various structures and layers form within the…

Q: A sperm encounters an egg's jelly coat thus triggering the acrosomal reaction. What is the first…

A: Egg cells are the largest of all the cells in our body and are about 100 microns in diameter. It is…

Q: A. Answer the following questions briefly (3-5 sentences only). 1. How are the three axes for…

A: Symmetry in biology refers to the balance and arrangement of body parts or features in an organism.…

Q: Internal and external fertilization both ……… occur only among birds. produce single-celled…

A: The question is asking us to identify a common characteristic between internal and external…

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: By the end of gastrulation the [Select] * has surrounded the outside of the embryo, the [ Select ]…

A: Gastrulation refers to the process by which a gastrula is formed from a blastula. Grastrula is the…

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 primary germ layer that forms the trunk muscles, heart, and skeleton is (a) ectoderm, (b)…

A: Organogenesis is the process of formation of different organs from the three germ layers, the…

Q: Where (specifically) does fertilization take place in the body? When the zygote divides, is it using…

A: Fertilization is the process of the combination of the genetic material of the sperm from the male…

Q: If an embryo was lacking HOX genes many problems might happen including this.. neural crest would…

A: The Hox genes' function in the embryo is to specify positional uniqueness instead of the formation…

Q: The cells of the embryoblast differentiate into the ______ andthe ______.a. epiblast, hypoblastb.…

A: During the process of fertilization, a male haploid gamete (sperm cell) fuses with a female haploid…

Q: Early human embryos have both male and female reproductive tissues but, by the time they are born,…

A: The intermediate mesoderm is responsible for the development of the reproductive organs. The adult's…

Q: Epithelium-Mesenchyme transitions (MET or EMT) are crucial morphogenetic events occurring during…

A: During EMT transition  there is loss of cell polarity as well as adhesion property of epithelial…

Q: All of the following  changes  take place during the last trimester of pregnancy EXCEPT- a, the…

A: Pregnancy is the state in which a woman carries a developing embryo or fetus within her uterus. It…

Q: How many somites are there in mouse? In chicks? In humans

A: In embryology, a somite is among a series of longitudinal blocklike sections into which the…

Q: All of the following events occur by the end of the eighth week of gestation EXCEPT Select one: a.…

A: The process of fertilization, that is, the fusion of male and female haploid gametes, leads to the…

Q: which takes place in the most posterior region of the embryo during tailbud elongation

A: The vertebrate body axis lengthens consecutively from the posterior side of the embryo, by the…