Explain the developmental and functional similarities and differences between:   1. Avian yolk sacs and mammalian yolk sacs   2. Avian chorions and mammalian chorions 3. Avian allantois and mammalian allantois

Q: What cells are found in each tissue type? X. Y.

A: Chondrocytes  is term used for cartilage cell , they are building block of the cartilage…

Q: Which of the following is true about identical twins?

A: Answer - They develop from a single fertilized egg that split into two Identical twins are also…

Q: Please match the early developmental structure on the left with the human structure it develops into…

A: Fertilization is a process in which male and female gametes fuse with each other to form Zygote .…

Q: State the function of homeotic genes. Describe how nurse cells in fruit flies can affect larval…

A: Homeotic genes are a group of genes that control the pattern of body formation during early…

Q: Amniocentesis and genetic screening reveal that a fetus carries a defective L1-CAM gene. What…

A: Amniocentesis and prenatal testing are the diagnostic tests performed before the child's birth. This…

Q: 20. Identify the structure labeled A and explain how the functioning of structure A is essential for…

A: A fetus refers to an unborn offspring which develops in the uterus of the mother. A fetus develops…

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: !) Consider the Spemann-Mangold organizer in amphibian development. Which of the -llowing statements…

A: The spemann-Mangold organizer helps in amphibian development.

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: 24) The process of gametogenesis starts with a stem cell in the gonads and produces gametes used in…

A: Male and female gametes are formed by the processes of spermatogenesis and oogenesis, respectively.…

Q: Describe the biological basis for the 1 : 1 ratio of malesand females at conception in mammals.

A: The reproduction mode in the mammals is sexual with fertilization of the male and the female gamete…

Q: 1. Draw an annotated diagram of a fetal pig (one external picture and one internal picture), making…

A: Fetal Pig Internal Picture and external picture:

Q: Compare and contrast embryogenesis and morphogenensis and Outline the difference of somatic…

A: Embryo  Embryo is the developing young one of multicellular organisms.

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: 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: Explain the significance and describe the features of fertilization and cleavage in early animal…

A: Animal embryonic development is also called as embryogenesis. After the fertilization of the zygote,…

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: State the neuromere origin of each brain region?

A: Introduction Neuromeres Are Known As The Segments Of The Neural Tube That Forms The Embryonic Brain…

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: When considering pubertal maturation in domestic and marsupial species, describe the underlying…

A: Puberty is an important process in the development of all human beings — a series of hormonal…

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: What critical developmental process/es are altered following retinoic acid-exposure, which may cause…

A:

Q: Gli3 and distal Hox gene expression Gradual reduction in distal Hoxd dosage Ноxd13 +/+ +/- +/+ +/-…

A: Hox genes specifies the identity of the limb region. It also sepcifies whether a particular…

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

A: Avian egg development.

Q: Illustrate the top-to-bottom and head-to-tail orientation of the fruit fly embryo.

A: The fruit fly is known as Drosophila melanogaster is a common fly found on fruits like ripe bananas.…

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: 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: Define gastrulation and morphogenesis.

A: The development of a baby from the zygote during pregnancy involves several stages. It starts with…

Q: Put “disappear”, if they disappear in the process of development and put the word “dissolved”, if…

A: Introduction Embryonic development is also called embryogenesis. It is the process where development…

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: S 138. A male newborn has albinism. The most likely cause of the lack of pigmentation in this…

A: The objective of the question is to identify the origin of the cells that are most likely…

Q: 1. Describe how teratogenic agents cause the deformity of the embryo and give specific example.

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

Q: What is the significancw of cleavage in early development? Discuss.

A: The repeated mitotic divisons of the fertilized egg (zygote) is called cleavage. It is preceeded by…

Q: 7. Maternal effect: In Limnaea snail cats, R makes right coiled shells; r makes left coiled shells,…

A: In snail (Limnaea peragra) two types of shell coiling is found one is dextral or right handed…

Q: What is the one defining characteristic that determines a mammal?

A: A) Well evolved creature, (class Mammalia), any individual from the gathering of vertebrate…

Q: ferent class

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

Q: nderstood, scientists do know that high levels of the hormone estrogen lead to the formation of r…

A: Oxytocin is a peptide hormone that is produced by the hypothalamus and stored in the posterior…

Q: Describe the development of the amniotic cavity, the bilaminar embryonic disc, the yolk sacs…

A: There are many different stages in the development of the fetus. After fertilization, the zygote is…

Q: 5 new structures that appeared in the 33-hours chick embryo and indicate the germ layer derivative…

A: The development of a chick embryo can be studied by dissecting the embryo and analyzing various…