Chimeras, Mosaics, and Other Fun Stuff

11 - 20 of 22 Answers

September 10, 2010: A friend who is a chemist told me about a recent discovery that fascinated me. Apparently, when a woman has a baby, not all of that baby's cells leave her body when the baby is born. He said fetal cells have been found living and growing in different sites in the mother's body. Is this true? Would that make her a mosaic? And what about babies that are miscarried--does the mom still carry cells from that baby in her body?
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November 12, 2009: I recently read about a case where a person had both a pair of X chromosomes and an X and a Y chromosome. How does that happen?
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April 23, 2009: How is a paternity test affected if the child is a chimera?
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September 27, 2007: Your article on chimeras had me enthralled, but could you please explain more in depth how it is possible for 2 zygotes to fuse and actually what should have been two people ends up as one? Shouldn't this be impossible?
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June 20, 2007: Why can't mules breed? I understand that a horse and a donkey make a mule but why can't 2 mules have a baby mule?
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February 9, 2007: I recently read Natalie Dye's response to a question about chimera DNA. As A Crime Scene Investigator and instructor this piqued my interest and has me wondering about DNA as it relates to bone marrow transplants. Would a person who receives a bone marrow transplant essentially now have two potential sources of DNA, the original pre-existing in the body's cells and now another from the donor cells of the bone marrow?
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April 28, 2006: What does chimera DNA look like? Are chimeras and mosaics the same thing? And are there any changes in chimera DNA?
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March 3, 2006: I was wondering if you could make a baby with 3 eyes. Is that possible?
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November 30, 2004: 1) On the CSI episode about the chimera, there was a disease mentioned (or shown) that began with a B. Do you know what that is? And why were there swirled patterns on the suspect's back when the special glasses were put on? 2) In the chimera episode, the fact that the guy was a chimera was first established through a camera flash on the skin illuminating skin anomalies (potentially through radiation??). Why is this the case? Presumably the bone marrow donor would not have been subject to radiation?
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September 16, 2004: When I was a camp counselor a few years back, one of the campers had light hair and a green eye with lighter eyelashes/eyebrows on one side and darker hair and a brown eye with darker eyelashes/eyebrows on the other. Also the lighter side had more freckles. The hair on her head was not bi-colored exactly symmetrically, but pretty close. How is this physiologically possible? I've never stopped wondering and the girl said that doctors couldn't explain it.
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