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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
What is the sit of the embryo development?
Embryo development occurs inside the uterus of a female reproductive system. The uterus provides a protective environment for the embryo to grow and develop during pregnancy, receiving nourishment and support from the mother's body.
What is the average weight of the placenta?
The average weight of a placenta is between 1-2 pounds. Variations in weight can occur due to factors such as gestational age, maternal health, and fetal size.
What happen if placenta is small?
A small placenta may result in inadequate nutrient and oxygen supply to the fetus, leading to growth restriction and potential developmental issues. It can also increase the risk of complications such as preterm birth and stillbirth. Close monitoring and potential medical interventions may be necessary to ensure the well-being of the baby.
What you call the layers of the gastrula?
The layers of the gastrula are the ectoderm, endoderm, and mesoderm. These layers give rise to different tissues and organs in the developing embryo during the process of gastrulation.
Does endometrium participate in the formation of the placenta?
No, the endometrium does not directly participate in the formation of the placenta. The placenta is formed from the embryonic tissue (trophoblast) and the maternal tissue (decidua) lining the uterus, not from the endometrium.
Does the ectoderm form neural tissues?
The ectoderm nearest the embryonic midline - often described as the neuroectoderm - does form into the neural tube, the embryonic structure from which the nervous system develops. However, more lateral ectoderm matures into skin and associated tissues.
What happens to the Cells in an embryo as the embryo develops?
As the embryo develops, cells undergo mitosis to increase in number, and then differentiate into different types of cells through a process called cell specialization. This leads to the formation of various tissues and ultimately different organs. The cells also start to organize into specific structures and patterns, leading to the development of the overall body plan.
How are cleavage and embryo different in meaning?
Cleavage is the division or split
Another definition is the portion showing between a woman's breasts that is often supported by a bra.
An embryo is a human that is still forming inside the uterus of a woman.
How true can ultrasound results be when telling an embryo's stage?
Ultrasound results are typically very accurate in determining an embryo's stage during pregnancy. This is because ultrasound technology provides detailed images of the developing embryo, allowing healthcare professionals to assess its growth and development with precision. However, there may be some margin of error, and it is important to follow up with additional ultrasounds to track the embryo's progress.
How does the egg or sperm compare to a fertilized embryo?
An egg is a mature female reproductive cell containing half the genetic material necessary for reproduction. A sperm is a male reproductive cell containing half the genetic material necessary for reproduction. A fertilized embryo forms when an egg and sperm unite, combining their genetic material to create a new individual with a full set of genetic information.
Why must the blood flows of the mother embryo be kept separate?
Separation of blood flows in the mother and embryo is necessary to prevent the mixing of blood types, which can lead to immune reactions or complications. Each circulatory system has its unique functions and exchange of nutrients and waste products occurs through the placental barrier while maintaining their individual blood environments.
How does embryology give evidence of evolution?
Answer
Embryology does not provide any evidence for evolution. Ernst Haeckel's comparative embryo drawings have been known to be fraudulent for over 60 years although they are still used in some textbooks and by some ardent evolutionists. Embryos are different all through their development. Use of such alleged evidence is at best misleading and at worst is downright deceitful.
Recent attempts to resurrect Haeckel's reputation only serve to show more details of his deceit. One example is how Haeckel deliberately left out the developing "heart pouch" from his drawings of the human embryo.
Second answer
Comparative embryology shows that many different lifeforms go through similar stages of development, which points to common origins. You can read more about this online. Regarding the aforementioned fraud, Robert J. Richards, Professor of the History of Science and Medicine at the University of Chicago, states that the claims are "logically mischievous, historically naive, and founded on highly misleading Photography." For more, see his paper "Haeckel's embryos: fraud not proven."
The Hox genes regulate body plans in embryological development, and are considered one of the primary pieces of evidence for common ancestry of species. Please also refer to the link from Christ's College on the Hox genes for that.
What does embryology indicate about different organisms?
Embryology shows that different organisms share similar stages of development and sometimes even common structures in their embryonic forms, suggesting a common ancestry. It can also reveal differences in the way organisms develop, highlighting their specific adaptations and evolutionary histories. Studying embryology helps scientists understand how various organisms have evolved and adapted to their environments over time.
What chromosome contains a gene that causes the gonads of an embryo to develop testes?
If you're a mammal, the key gene that initiates gonad development into testes (the Sry gene) is located on the Y chromosome. However, be aware that while gene necessary for the initiation of the male developmental program is located on the Y chromosome, many genes absolutely essential for complete testes and male development are distributed across many other chromosomes.
Yes, alcohol can cross the placenta from the mother's bloodstream to the fetus. This can have harmful effects on the developing baby's growth and development, leading to a condition known as Fetal Alcohol Spectrum Disorder (FASD). It is important for pregnant women to avoid consuming alcohol to protect the health of their baby.
What is the relationship between placenta and umbilical cord?
The placenta is an organ that develops during pregnancy, and it connects the fetus to the uterine wall to provide nutrients and oxygen. The umbilical cord is a flexible tube-like structure that contains blood vessels connecting the fetus to the placenta. The umbilical cord allows for the exchange of nutrients, oxygen, and waste products between the fetus and the mother's bloodstream through the placenta.
An embryo is important because it represents the earliest stage of development in a new organism. It has the potential to grow and develop into a fully formed individual. Studying embryos can provide valuable insights into biological processes, development, and genetics.
What is the outermost layer of two membranes surrounding the embryo?
The outermost layer of two membranes surrounding the embryo is the amnion. The two membranes are the amnion and the chorion, which together form the amniotic sac that surrounds and protects the developing embryo.
What do you call the seed structure that stores food for the embryo?
The seed structure that stores food for the embryo is called the endosperm. It provides essential nutrients for the developing plant embryo to germinate and grow.
What happens in the placenta after birth?
After birth, the placenta is expelled from the mother's body in a process known as afterbirth. It is no longer needed as the baby is no longer connected to the mother's blood supply. In some cultures, the placenta is traditionally buried or disposed of in a specific way.
What develops first in the embryo?
During embryonic development, the process of gastrulation occurs first. This is when the three primary germ layers (ectoderm, mesoderm, endoderm) form, from which all tissues and organs will develop. Following gastrulation, organogenesis begins where specific organs and structures start to form.
What does it mean that an embryo at 6-7 weeks is bipotential?
Bipotential means that the embryo has the potential to develop into either male or female sex organs. At this stage, the primordial gonads are undifferentiated and have the capacity to develop into either testes or ovaries, depending on genetic and hormonal factors.
What can embryos be tested for?
Embryos can be tested for genetic disorders, chromosomal abnormalities, and certain inherited conditions through preimplantation genetic testing (PGT). This can help identify any potential health issues before implantation during in vitro fertilization (IVF) procedures.
What primary germ layers of the embryo does the epidermis of the skin develop from?
The epidermis of the skin develops from the ectoderm, which is one of the primary germ layers of the embryo. The ectoderm gives rise to various tissues and structures related to the skin, nervous system, and other epithelial tissues.
No, the separation of an egg and its polar body after fertilization does not typically harm the development of the embryo. The polar body is a byproduct of egg cell division and its removal does not affect the genetic material necessary for embryo development.
