1
Down syndrome is a genetic disorder where a person is born with an extra chromosome.
2
The extra chromosome 21 was derived from the mother.
3
The extra chromosome X was the result of paternal first meiotic nondisjunction of X and Y.
4
The cytogenetic findings for the newborn girl showed an extra chromosome interpreted as an isochromosome 9p.
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People with mongolism, or Down's syndrome, have an extra chromosome in the twenty-first pair of autosomes.
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Down's syndrome, which results in some degree of learning disability, is caused by an extra chromosome in a person's cells.
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Genetic analysis with microsatellites from chromosome 18 confirmed the maternal origin of the extra chromosome 18.
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The extra chromosome 17 probably originated from a postzygotic mitotic nondisjunction of the maternal chromosome 17.
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The extra chromosome derives from the mother in 93% of cases and is due to abnormal chromosome segregation during meiosis (nondisjunction).
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Down syndrome is caused by the presence of an extra chromosome 21, bringing the total of chromosomes to 47 instead of 46.
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Cells with different extra chromosomes accumulated mutations at distinct rates and displayed diverse adaptive events.
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All that can be safely laid down is that the character of the reproductive organs is determined by the extra chromosomes.
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"Vampires and witches have an extra chromosome pair," Matthew explained.
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I was seriously considering "Forty Six & Two," Tool's mini-opus about mankind's ascendancy to a higher level of existence via two extra chromosomes.
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"Daemons have a single extra chromosome."