Sometimes a baby who has a particular syndrome or disorder will have it in a mosaic form: some of the cells in the baby's body will have the extra genetic material which characterises the disorder, the others may be normal.
The presence of two or more cell populations that have a different genetic or chromosomal makeup in a single individual or tissue.
A condition in which an individual has two or more types of cells that differ in a portion of their genetic make-up.
The co-existence of genetically different cells within the same individual or tissue. e.g. a mixture of both normal cells and cells with a chromosome abnormality.
Having more than one blood line. For example, instead of having all 46XX cells, a mosaic may have a combination of 46XX and 45X cells. See Klinefelter's and Turner's Syndrome.
presence in an individual of two or more separate cell lines which are distinct from one another but arose from the same source.
A type of Down syndrome in which only some of a baby's cells have the extragenetic material that characterizes the disorder.
the presence in an individual of two or more cell lines that are karyotypically or genotypically distinct and are derived from a single zygote
Where a person carries two lines of cells with different karyotype or genotype. Chromosomally this can occur in different ways, the ratio normal:abnormal depending on when the error occured. The most common is for a mitotic non-disjunction leading to two cells one trisomic and the other monosomic, normally lethal to the cell. Depending on the time, site and viability of the surviving cell, this can have a number of effects. If the fetus/child has a low proportion of trisomic cells, there may be no or reduced signs of the syndrome. If the gonad is involved, the resulting adult, while phenotypically normal, may be at higher risk of producing abnormal offspring.
the presence of two or more chromosome patterns in the cells of a person, resulting in two or more cell lines (i.e., some with 46 chromosomes, others with 47).
A condition in which tissues of genetically different types occur in the same organism.
The presence of mutated as well as normal alleles in the cells, which produce gametes.