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Embryology
Embryology is a branch of biology. It involves the study of the embryo from conception until the point at which the zygote becomes a fetus.
788 Questions
The phase you're referring to is called cleavage, which occurs during the early stages of embryonic development. Cleavage involves rapid cell divisions without growth in between, resulting in smaller cells with each division.
The study of similar structures that appear during the development of different organisms is known as evolutionary developmental biology, or "evo-devo" for short. This field seeks to understand how genetic changes can lead to the evolution of new structures and functions during development.
What is name of the temporary projection on the beak in embryo birds?
The egg tooth is the structure that develops on the upper mandible, near the tip of the beak, in a chick before it hatches.
The neck muscles push the egg tooth against the shell to crack it open.
The stored food inside the seed is used up by the seedling. Seedling after establishing itself as a new plant starts absorbing nutrients and water with the help of its root and starts synthesizing its own food by photosynthesis.
it is the action of fertilising an egg with the sperm of a closely related species. Tests are done on the embryos for a period of no more than 14 days (two weeks) and then the embryo must be destroyed.
* Cytoplasmic embryo or cybrid: where a human cell is inserted into an animal's egg that has been stripped of nearly all its nuclear DNA. The embryo would be 99.9 per cent human and 0.1 per cent animal.
What structue will the yolk plug of a frog embryo would eventually develop into?
The yolk plug of a frog embryo will develop into the endoderm, which is one of the three primary germ layers. The endoderm gives rise to the gastrointestinal tract and associated organs.
Chorda mesoderm, also known as the notochord, is a structure found in the embryos of chordates. It provides structural support and is involved in early development of the central nervous system. The notochord is eventually replaced by the vertebral column in vertebrates.
The Ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers.
The Ectoderm forms: the central nervous system, the lens of the eye, cranial and sensory, the ganglia and nerves, pigment cells, head connective tissues, the epidermis, hair, and mammary glands
A viable embryo is an embryo that has the potential to develop into a healthy offspring under normal conditions. This typically means it has successfully reached a developmental stage where it can be transferred or implanted into a uterus to continue its growth into a fetus.
What is the scientific order and family of fishes?
A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups. Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.[1][2] Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). At 32,000 species, fish exhibit greater species diversity than any other group of vertebrates.[3]
Fish are an important resource worldwide, especially as food. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
Because the term "fish" is defined negatively, and excludes the tetrapods (i.e., the amphibians, reptiles, birds and mammals) which descend from within the same ancestry, it is paraphyletic, and is not considered a proper grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.
The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods.
Is there a significant change in overall size from morula to blastula stage.?
There is a significant change in overall size from the morula stage to the blastula stage. During the morula stage, the embryo is a solid ball of cells and is relatively small in size. However, during the blastula stage, the embryo undergoes a process called blastulation, in which the cells reorganize and form a fluid-filled cavity called the blastocoel. This results in a larger and more complex structure. The blastula stage is also characterized by the formation of two distinct cell types: the inner cell mass and the trophoblast. These cell types will give rise to the embryo and the placenta, respectively. Overall, the blastula stage represents a significant milestone in the development of the embryo.
Human embryos develop for about how long?
After two weeks the embryo becomes a fetus and after nine months the fetus becomes a child and after seventy years the child becomes a corpse.
Endoderm: (most internal germ layer) gives rise to the lining of the digestive tract and the organs derived from it, such as the liver and lungs of vertebrates.
Mesoderm: (middle germ layer) forms muscle, the skeletal system, and the circulatory system.
Ectoderm: (most exterior germ layer) gives rise to the outer covering and, in some phyla, to the central nervous system.
What is the size of a 4 to 5 week embryo?
The smallest baby is about the size of a small mobile phone
What kind of plant has an embryo enclosed in a protective coat?
Seeds have various layers, consisting of a skin or shell of some kind on the outside, then layers of nutrient, and the embryo at the middle.
Hawk nests are just mats of sticks, placed on an elevated cliff, or in the fork of a tree.
What part of the frog egg grows into an embryo?
The little black dot in the egg is the part that grows into an embryo.
What is the difference between the development of embryos in placentals and marsupials?
The embryo in a placental mammal is fully developed within the mother's uterus, sustained by the placenta, through which it receives all the nutrition it needs. Its organs are fully developed and it is able to survive outside the mother's body once it is born. It requires mothers' milk (or a suitable substitute) when it is born, but it can live independently of the mother, given the right care.
Baby marsupials are born extremely undeveloped, and are unable to survive at all outside the mother's body, until they can reach the pouch. They are born after a much shorter gestation period than a placental of equivalent size, and even the largest species of marsupial is only the size of a jellybean when it is born. After birth, it must climb up the outer fur of the mother and into the pouch where it attaches itself to a nipple. The teat swells in the joey's mouth, securing it in place so it cannot be accidentally dislodged. The joey will usually stay in the pouch for about 6-9 months, depending on the species, until it is developed enough to leave the pouch and move about independently.
