In human terms, think of non-identical twins who merge when they are only made up of a few cells and become one individual with cell lines belonging to each twin. Chimera catsĪ chimera is an animal that is made up of two distinct cell lines which occur when two zygotes fuse together in early development. The donor bone marrow produces blood cells which are a different cell line to the rest of the recipient’s body. So, the cat may be genetically red, but the distinct cell line may affect the hair and produce spots of black.Īnother less common type of mosaicism occurs with somebody who has undergone a bone marrow transplant. The embryo develops into a kitten with two distinct cell lines. In a mosaic cat, all the cells come from one original embryo, but a mutation or abnormality occurs in a cell of the developing embryo resulting in a block or blocks of cells genetically different from the rest of the embryo. The addition of the extra chromosome usually results in infertility in the male.
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