GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Sheep/goat chimera. Chimera or chimaera, a creature which contains a mixture of genetically different tissues, in this case those of a sheep and a goat. A chimera is created by mixing together the cells from separate embryos, and then implanting them into a surrogate mother. The composite nature of this chimera can be seen as areas of thin white goat fur, and thick grey sheep wool. A chimera has a composite nature because the embryo cells were only physically mixed together; no genetic material was transferred between them. Its sex cells also developed from either one embryo or the other, meaning that its offspring will be "pure breeds", not another chimera.
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