Embryology

During this time period, the embryo is known as a fetus. It continues to grow and develop, with its organs maturing and becoming more functional. By the time of birth, the fetus is fully developed and ready to survive outside the womb.

Actually yes it can. Embryos, DNA sequences, and fossils amongst others things can help show similarities within species. This can show that those species have similar traits because they evolved from a common ancestor. But those differences show why they are different species and thus evolving.

Yes, the human embryo undergoes a series of developmental changes as it grows and matures. These changes include the formation of different organs and tissues, the development of body systems, and the growth in size and complexity. The embryo transforms into a fetus over the course of pregnancy through a process called embryogenesis.

The embryo develops in the uterus of the mother.

This was a research done by Hans Spemann, an embryologist of the early 20th century in Germany.

His research lead him to conclude that the dorsal and ventral (top and bottom) halves of the embryo were different. The top half contained a certain group of cells that organize development. They are visible on the dorsal surface of a 2-cell-stage embryo.

The outcome of his constriction experiments depended on exactly where this structure was in relation to the constriction. If one half of the constriction contained the entire structure, it would develop into an embryo that could live and the other half developed into the belly-piece.

If the structure was evenly split during the constriction, the result was twin, including Siamese twin, embryos. If it was split unevenly, it resulted (in some cases) an embryo with two heads (a Siamese twin).

He also inadvertently discovered a way to clone during this process of constricting embryos as they split.

Embryo screening can raise ethical concerns because it involves selecting embryos based on certain criteria, which could lead to discrimination against individuals with certain genetic traits or conditions. There is also the risk of misuse, where screening might be used for non-medical purposes such as selecting for specific physical attributes. Additionally, it could have implications for societal attitudes towards disabilities and diversity.

An embryo is the early stage of development in a multicellular organism, typically referring to the period from fertilization to the end of the eighth week of gestation in humans. It is during this stage that the basic structures of an organism are formed.

The embryo gets its nutrients from the mother through the placenta once the egg is fertilized. The egg itself doesn't need to contain a food store because it relies on the mother's body for nourishment and support during its development.

An embryologist can earn an average salary of around $50,000 to $80,000 per year, depending on experience, location, and employer. Salaries can vary based on factors such as education, certification, and specific job responsibilities.

vagina

Answer

In the uterus.

5-7 days after fertilization, the blastula attaches to the wall of the uterus. When it comes into contact with the endometrium it implants. It then becomes and embryo.

Embryo screening checks an embryo to see if it's carrying any alleles for a genetic disease (e.g. Huntington's disease or cystic fibrosis) so that the parents would know how likely it would be for their offspring to have a genetic disease.

And the reason this is often perceived as a bad thing is due to the choice the would be parents would then make. They would be deciding wether to have a termination because of the genetic disorder. Of course the parents could potentially want to know just to plan the future and an ethically challenging situation would not occur.

cotyledon

Exposure to heavy metals like lead, mercury, and cadmium can affect fish embryo development by causing abnormalities, reduced hatching success, and developmental delays. These heavy metals can accumulate in tissues, disrupt essential processes like cell division and organ development, and lead to long-term impacts on the health and survival of fish embryos. Prevention measures such as regulating industrial discharges and monitoring water quality are crucial to protect fish populations from the harmful effects of heavy metals.

Studying embryos of animals with backbones can help elucidate evolutionary relationships by identifying similarities and differences in developmental processes. By comparing developmental stages and gene expression patterns, researchers can infer common ancestry and evolutionary relationships among different species. This information can provide insights into the evolutionary history of vertebrates and help reconstruct their phylogenetic relationships.

The placenta is the part of the amniotic egg that supplies food to the developing animal. The yolk provides it with food, and the albumin supplies water and nutrients.
The Yolk. Yolk is a sac that is attached to the embryo that supplies food.

Beans and peanuts store food as starch in the form of cotyledons within the embryo. These cotyledons provide the energy and nutrients needed for the seed to germinate and establish as a new plant. The stored food reserves in the embryo support the initial growth of the seedling until it can photosynthesize and produce its own food.

The chemical released by sperm during fertilization is an enzyme called acrosin. Acrosin helps the sperm penetrate the protective layer around the egg, facilitating fertilization.

The shell of the egg acts as a protective barrier to prevent the embryo from drying out. It is porous enough to allow for gas exchange but also helps to maintain the necessary humidity levels within the egg.

The embryo gets all the oxygen, and all the nutrients that it needs from the mother's blood supply, all of which crosses the placenta, through the umbilical cord into the embryonic blood system.

Yes, melanocytes are derived from the neural crest cells, which are a transient structure that arises from the ectodermal germ layer during embryonic development.

A polar body is smaller than a regular egg cell and lacks sufficient cytoplasm and organelles to support the development of an embryo. It contains only a small amount of genetic material as its main function is to discard the extra set of chromosomes during meiosis. As a result, a polar body does not have the resources necessary for successful embryonic development.

Embryos of different animals may look similar due to shared evolutionary history. This concept is known as embryonic homology and suggests that animals with a common ancestor will display similarities during early development. Shared genetic and developmental pathways contribute to these similarities, even if the adult forms of the animals look very different.

The embryo is fed the mother's blood, so the immune system doesn't attack it. There may be another reason, too. However, sometimes it does, which results in a miscarriage. Note that not all miscarriages are from that, though.

Just before hatching begins, the air cell expands to approximately 30% of the internal volume of the egg. As hatching begins, the beak of the embryo penetrates the inner shell membrane where it forms the inner wall of the air cell. The lungs begin to function, inhaling the air from the air cell.