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What are embryonic lethal mutations?
Embryonic lethal mutations are genetic mutations that prevent an organism from developing past the embryonic stage, leading to death in utero. These mutations can be caused by defects in essential genes or developmental processes, resulting in non-viable embryos. These mutations are important to study to understand gene function and embryonic development.
What is the main source of embryonic stem cells?
The main source of embryonic stem cells is embryos that are created in a laboratory through in vitro fertilization techniques. These embryos are usually donated for research purposes with informed consent from the donors. Embryonic stem cells are pluripotent, meaning they have the ability to differentiate into all cell types in the body.
Where do scientists get embryonic stem cells?
Embryonic stem cells are typically obtained from excess embryos created during in vitro fertilization procedures with informed consent from the donors. These embryos are usually donated for research purposes and are not created for the sole purpose of harvesting stem cells.
How do scientists extract human embryonic stem cells?
Human embryonic stem cells are typically extracted from the inner cell mass of a blastocyst, a structure that forms a few days after fertilization. The blastocyst is usually donated for research purposes with informed consent from the donors. Researchers can then extract the stem cells from the inner cell mass by using techniques that dissociate the cells from the embryo.
Why do you graft plants?
DNA grafting is when a segment of DNA is removed and is replaced by another form of the DNA structure. The replaced DNA structure is usually bound together tightly until the original DNA "forms" into the replaced structure.
What is the embryonic structure that is usually replaced by the backbone?
notochord
Where does the first opening which developes in the deuterostomes develope into?
In deuterostomes, the first opening that develops during embryonic development is called the blastopore. This opening typically develops into the anus, while the mouth forms later from a secondary opening. This is in contrast to protostomes, where the blastopore usually becomes the mouth. Examples of deuterostomes include chordates and echinoderms.
What is the difference in the skeleton between phylum arthropod and phylum chordate?
Phylum arthropoda is characterized by their exoskeleton, or "wearing" the anatomical compoent providing structure on the outside; whereas chordates usually have an internal skeleton or at least a notochord. Chordates like fish, birds, amphibians, reptiles, mammals are recognizable by having some kind of spinal column. (Chordates without a formal backbone still would not have an exoskeleton like the arthropods). Chemical differences are also apparent, the bulk of arthropod skeletons are made from proteins including the tough long-chain polymer chitin, whereas chordates usually employ bones made from mineral compounds like those of calcium and phosphorus.
What are embryonic lethal mutations?
Embryonic lethal mutations are genetic mutations that prevent an organism from developing past the embryonic stage, leading to death in utero. These mutations can be caused by defects in essential genes or developmental processes, resulting in non-viable embryos. These mutations are important to study to understand gene function and embryonic development.
What is the main source of embryonic stem cells?
The main source of embryonic stem cells is embryos that are created in a laboratory through in vitro fertilization techniques. These embryos are usually donated for research purposes with informed consent from the donors. Embryonic stem cells are pluripotent, meaning they have the ability to differentiate into all cell types in the body.
What is the percentage of Barr body in normal humans?
In normal human females, approximately 90-95% of cells have a Barr body. This structure is a condensed, inactive X chromosome that forms during embryonic development in females to help compensate for having two X chromosomes.
What is the origin of corpus bones?
Corpus bones are usually referencing the bony structures that make up the skeletal system. These bones develop from mesoderm tissue during embryonic development. The term "corpus" itself comes from Latin, meaning body or structure.
How do you repair a alto saxophone pad?
The pads are usually replaced when worn out, rather than replaced.
Are neurons replaced in the human brain?
No, neurons are not typically replaced in the human brain. Once neurons are damaged or lost, they are not usually regenerated or replaced.
If a pendant is lost of stolen can it replaced?
Wether or not a pendant can be replaced if it is lost or stolen all depends on if a warranty came with it when it is purchased . If there was no warrantee then usually it can not be replaced.
Where do scientists get embryonic stem cells?
Embryonic stem cells are typically obtained from excess embryos created during in vitro fertilization procedures with informed consent from the donors. These embryos are usually donated for research purposes and are not created for the sole purpose of harvesting stem cells.
Do neurons get replaced in the human brain?
No, neurons in the human brain do not typically get replaced. Once neurons are damaged or lost, they are not usually regenerated or replaced by new neurons.
