![]() ![]() Microchimerism - Fetal cells penetrate into the maternal circulatory system and take root in its tissues.Because of this, the organs and cells of one organism have a different chromosomal set. This happens when the first stages of formation of one of the embryos absorbs the second. Tetragametic - two ovules merge into one, but each of them is fertilized by different spermatozoa.A defect can be associated with mixing cells of living and deceased twins in the mother's womb or by combining two zygotes into one embryo. This pathology provokes the appearance of karyotype 46, XX / 46, XY. The causes of chimerism are varied, most often this is the mixing of blood. A similar defect occurs when organs are transplanted and even when blood is transfused.įrom a genetic point of view, mutations arise due to the presence of two or more cellular strands in a person developing from different zygotes. Or twins, who grew up in one womb, have tolerance to each other's blood group. If a complete fusion occurs, this indicates a bloody pathology when the child has two strands of DNA. Very often this manifests itself as the distribution of different pigmentation on the body. The pathological condition has several types and forms, which differ in the causes of the onset.īiological chimeras can occur when incest of two different races. It has nothing to do with mythology and is based on a specific mutation of genes in the process of embryo conception and development. To date, about 100 cases of human chimerism are known. In Greek mythology, the chimera is represented by a monster with a goat's body, a head and a neck of a lion and a snake's tail. In humans, it has several types and causes of appearance, we will consider it in more detail. Simultaneous presence of cells of different genotypes in the body is chimerism. ![]()
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