Chimerism
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General Information
Someone with two or more different sets of DNA is known as a chimera. Many people with chimerism and XX/XY chromosomes have both ovarian and testicular tissue, while others have only testes or only ovaries. Others still have gonadal dysgenesis. Some have noticable genital differences while others do not.
Someone can be born with chimerism when multiple zygotes combine and develop into one fetus (this can occur in the case of fraternal twins).
"Sex-chromosme discordant chimerism" is when at least one embryo with XY chromosomes fuses with at least one embryo with XX chromosomes. A person who develops in this way would have sets of both XX and XY chromosomes, for a chromosome pattern of 46XX/46XY, and could have a wide variety of different possible sex characteristics.
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