I'm not 100% on the exact details, but I do know that Yes, they receive chromosomes from both parents but in the case of DNA for the chimeric baby that was half male half female... he had both female and male DNA. However, in the case of the 2 women whose dna didnt match with their childrens the women both had two seperate sets of female dna in which each was more prevalent in different organs and parts of the body therefore explaining why their dna didnt prove to match their childrens with the areas that were tested. But it did match in other areas.