2006-07-29 20:25:38 · 5 answers · asked by mrezaimanesh 1 in Health ➔ Diseases & Conditions ➔ Respiratory Diseases
In zoology, a chimera is an animal which has two or more different populations of genetically distinct cells that originated in different zygotes; if the different cells emerged from the same zygote, it is called a mosaicism. It is either acquired through the infusion of allogeneic hematopoietic cells during transplantation or transfusion or it is inherited. In fraternal twins, chimerism occurs by means of blood-vessel anastomoses. Chimeras are named after the mythological creature Chimera.
Chimeras are formed from either four parent cells (two fertilized eggs or early embryos are fused together) or three parent cells (a fertilized egg is fused with an unfertilized egg or a fertilized egg is fused with an extra sperm). Each population of cells keeps its own character and the resulting animal is a mosaic of mis-matched parts. An analogy is two jigsaw puzzles cut using an identical cutter, but with different pictures. You can make a single puzzle out of the mis-matched parts, but the completed puzzle will show parts of both different pictures. Chimeras can often breed, but the fertility and type of offspring depends on which cell line gave rise to the ovaries or testes.
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The term chimera (alternatively chimaera) or chimeric is often used metaphorically to describe things that have combined attributes from different sources. In genetics, for example, an organism or tissue created from two or more different genetic sources is called chimeric, as in transplant patients with organs from other donors. Most other usages are related to this metaphor. The word chimera is also generally accepted to mean an unreal ambition, a fanciful scheme, or even a castle in the air. This is in clear contrast with its old meaning of a bogey or an irrational fear.
2006-07-29 20:29:49 · answer #1 · answered by Celtic Tejas 6 · 0⤊ 0⤋
As far as I know, a chimaera is a mythical creature and is usually compared to the rare people who have 2 sets of DNA...
2006-07-29 20:28:56 · answer #2 · answered by Everything 4 · 0⤊ 0⤋
A whole or complete object or thing composed of various different parts.
2006-07-29 20:29:48 · answer #3 · answered by Guppie_75 2 · 0⤊ 0⤋
means that the drug has 2+ targets. ie it hits in 2+ places
2006-07-31 05:26:58 · answer #4 · answered by shiara_blade 6 · 0⤊ 0⤋
recording label is what the dictioary says
2006-07-29 20:30:30 · answer #5 · answered by g-day mate 5 · 0⤊ 0⤋