......... 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: Which of the following are derived from 'trophoblasts'? 1.  epiblast 2.  hypoblast 3.  amnion 4.…

A: After fertilization of the egg and ovum, they produce zygote that start developing by repetitive…

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: is when an egg is released from the ovary. This typically occurs once a month in females.

A: Branch of biology that deals with the study of all those processes which take place during…

Q: The first “milk” the mother produces is called ______________. After an egg is fertilised it is…

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

Q: Draw and asnwer the blank spots

A: Approach to solving the question: Detailed explanation:Examples: Key references:

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: 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: Part 2: Which step triggers release of enzymes by the head of a sperm cell which help dissolve the…

A: Sure, let's break down each step of fertilization and arrange them in the correct order:Penetration…

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: 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: When the fetus is fully developed and takes up the maximum amount of space in the uterus, the…

A: : Detailed explanation:a) Fetal delivery is an example of which type of feedback loop?Fetal delivery…

Q: Which of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky…

A: Fertilization in xenopus embryos is  mainly complex multi-step process that completed in 24 hours.…

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: Which mechanism prevents an ovum from being fertilized by multiple sperm cells? Select one: a. When…

A: In internal fertilization, the occurrence of polyspermy or an ovum being fertilized by multiple…

Q: Which of the following statements concerning oogenesis is false?   Oogenesis begins before birth.…

A: Oogenesis is the process by which an ovum (egg cell) differentiates into a cell capable of…

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: 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: 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: What do you mean by trophoblast?

A: Trophoblast is layer of a particular type of cells. A cell is the basic structural and functional…

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: 5. What is the name of the outer cell layer of the blastocyst and what does it give rise to? Does…

A: Introduction  Human fertilisation is the joining of a human egg and sperm, which takes place in the…

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: Rarely, two sperm may penetrate a secondary oocyte. Do youthink this fertilized cell will survive…

A: Fusion of only one sperm takes place with the egg.

Q: During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the…

A: The process during the development of the embryo where the folding of blastula on itself results in…