chimaera meaning biology

Let us know if you have suggestions to improve this article (requires login). This tutorial investigates perception as two people can interpret the same thing differently. Muscle cells are specialized to generate force and movement.

In genetics and molecular biology, a chimera is a single DNA sequence originating from multiple transcripts or parent sequences. However, the formation of artificial chimeras can also be a useful tool in the molecular biology. Some organisms are comprised of only one cell whereas o.. Views expressed here do not necessarily reflect those of Biology Online, its staff, or its partners. Learn more. Indications of tetragametic chimerism include eyes differing in colour, patchwork skin coloration, and ambiguous external genitalia, which is a sign of hermaphroditism (having both male and female reproductive organs).

The latter is known to occur with sequencing of electrophoresis gels.[5]. Human microchimeras are produced when fetal stem cells or maternal cells cross the placenta (fetal-maternal microchimerism) or following blood transfusion (transfusion-associated microchimerism) or organ transplantation. PCR chimeras are an important issue to take into account during metabarcoding, where DNA sequences from environmental samples are used to determine biodiversity. The most widely known examples of twin chimerism are blood chimeras. chimera definition: 1. in Greek mythology (= ancient stories), a creature with a lion's head, a goat's body, and a….

All Rights Reserved. Chimera, in genetics, an organism or tissue that contains at least two different sets of DNA, most often originating from the fusion of as many different zygotes (fertilized eggs).
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A chimera is a novel sequence that will most probably not match to any known organism. (For information on the phenomenon in plants, see chimera.).

It can occur in various contexts. The sea was teeming with life.

(Under normal circumstances, in the absence of zygote fusion, two fertilized eggs result in the production of dizygotic, or fraternal, twins.) Chimera definition is - a fire-breathing she-monster in Greek mythology having a lion's head, a goat's body, and a serpent's tail. [2] It is estimated that approximately 1% of all transcripts in the National Center for Biotechnology Information's Unigene database contain a "chimeric sequence". How to use chimera in a sentence., University of Minnesota - Health Sciences - Chimeras. It is usually considered to be a contaminant in transcript and expressed sequence tag (which results in the moniker of EST chimera) databases.

It also covers population genetics, particularly gen.. Eventually, through reproduction and continued variation, fish came about. Our editors will review what you’ve submitted and determine whether to revise the article. Did You Know?

This lesson looks at population attributes, regulation, and growth. The chimera was generated from a host embryo and embryonic stem cells, resulting in albino (white skin and pink eye) and brown skin (with black eye) characteristics. [3], A chimera can also be an artifact of PCR amplification. In human blood chimeras of the same sex, chimerism may be detected through routine blood typing, when unexpected results prompt further genetic investigation. Chimera (Science: cell biology) organism composed of two genetically distinct types of cells. The term is derived from the Chimera of Greek mythology, a fire-breathing monster that was part lion, part goat, and part dragon. In most instances, however, there are no observable symptoms of tetragametic chimerism, and the condition is detected only through extensive genetic analysis when standard tests, such as histocompatibility testing for tissue matching prior to organ transplantation, turn up unusual results. Revisit some of the ecosystems you.. Weaving cartilage at zero g: the reality of tissue engineering in space, The chimeric eukaryote: Origin of the nucleus from the karyomastigont in amitochondriate protists.

Dispermic chimerism can also occur when a zygote fuses with a fertilized polar body (a small degenerative cell produced by egg cell division). The term is derived from the Chimera of Greek mythology, a fire-breathing monster that was part lion, part goat, and part dragon. Updates? a string of letters in a file that can be read as a DNA sequence) that originates from an actual chimera (i.e. Can be formed by the fusion of two early blastula stage embryos or by the reconstitution of the bone marrow in an irradiated recipient or by somatic segregation.

Chimaera definition: any tapering smooth-skinned cartilaginous deep-sea fish of the subclass Holocephali (or... | Meaning, pronunciation, translations and examples The aborted product anneals to the wrong template and continues to extend, thereby synthesizing a single sequence sourced from two different templates.[4]. The cell is defined as the fundamental, functional unit of life.

The former may be produced when a fertilized egg generated through parthenogenesis (a form of asexual reproduction) fuses with a normal zygote. When blood chimerism involves male and female twins, female exposure to male hormones results in freemartin syndrome, in which the female is masculinized; this commonly is seen in cattle and rarely in humans. Human androgenetic chimeras appear to arise through the fusion of a normal zygote with an egg that lacks its own nucleus but has been fertilized and contains a duplicate paternal nucleus. Exceptions include the members of the genus Callorhinchus, the rabbit fish and the spotted ratfish, which locally or periodically can be found at relatively shallow depths.Consequently, these are also among the few species from the chimaera order kept in public …

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