LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Embryo paternity testing. Computer artwork of a paternity test of an embryo (at upper right). A sample of DNA, deoxyribonucleic acid (orange & red strand), is taken from the embryo and its parents. The genetic code formed from the four bases (at bottom right) on this DNA is revealed by a process called electrophoresis. The DNA bands are transfe- rred onto an autoradiograph (white sheet) for comparison. The embryo's DNA comes partly from each parent as the father's sperm fertilizes the mother's egg (top left). Therefore any of the embryo's DNA bands, or genetic markers (blue rectangles, lower left), which do not match those of its mother must match those of its father.
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