Chimeras, Mosaics, Twins, and Other Fun Stuff
1 - 10 of 39 Answers
May 15, 2013:
A female egg has 23 chromosomes and a male sperm also has 23 chromosomes, which is equal to 46 chromosomes and a viable embryo. What if you took the genetic material out of an egg and put it into another egg? You'd still have 46 chromosomes and that's all that's needed, right? The resulting offspring would be guaranteed female but wouldn't 46 chromosomes still result in viable embryo as well? Even if it's from two eggs instead of an egg and sperm?
October 24, 2012:
How many different combinations of people are possible? I suppose it should be the number of genes multiplied by the number of alleles per gene, is that correct?
July 11, 2012:
Is there any explanation as to why a brother and sister cannot have boys? My sister in law has only been able to have girls and my husband and I can't get pregnant with a boy.
February 16, 2012: Is it ever possible for a person or an animal to have one biological parent rather than two?
November 17, 2011: What type of test can be done to determine if you are a chimera?
August 31, 2011: Why do zebras have two different colors (black and white)? What color is dominant or recessive?
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?
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?
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?
June 14, 2011: Do clones have anything in common other than the way they look?
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January 26, 2005: Mi padre es un gemelo idéntico y el abuelo de mi esposo es gemelo fraterno. ¿Esto puede aumentar nuestra probabilidad de concebir gemelos, o es esto un rasgo genético que solo viene de la mamá y solo se refiere a gemelos fraternos? (Siempre hemos querido gemelos- un niño y una niña).