Chimeras, Mosaics, Twins, and Other Fun Stuff

21 - 30 of 56 Answers

February 16, 2012: Is it ever possible for a person or an animal to have one biological parent rather than two?
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November 17, 2011: What type of test can be done to determine if you are a chimera?
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August 31, 2011: Why do zebras have two different colors (black and white)? What color is dominant or recessive?
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July 20, 2011: I have a couple of questions. First what are semi-identical twins? How are they different from identical or fraternal twins? Do they look more fraternal or identical or are they somewhere in between? Second, how can Mary-Kate and Ashley Olsen look so similar but be fraternal twins? Could they perhaps be semi-identical twins?
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July 13, 2011: DNA is passed from parent to child. When a woman carries a child that came from a donor egg (not of any blood or genetic relation to the woman), due to her blood being the same blood that pumps through the heart of the fetus inside her, does that fact change or alter the DNA of the fetus/child to show any blood or genetic relation to the woman who carried that fetus/child?
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June 22, 2011: I've had a hysterectomy but my daughter wants to harvest her eggs for me and my husband so we can have a child of our very own! If I use my daughter's eggs, can HER father's DNA be removed from the egg, leaving only my DNA? Then when my husband fertilizes the egg, it'll be 100% our child together. Is that possible?
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June 14, 2011: Do clones have anything in common other than the way they look?
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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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April 27, 2010: Is it possible to create a gene of wings and literally put them in the DNA of a human?
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April 7, 2010: As a geneticist, what do you think of the Starchild skull? In case you don't know, this is the 900 year old skull found in Mexico that might be half alien and half human.
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