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Individual who has one copy of the allele for a recessive disorder and does not exhibit symptoms.


Change to a chromosome in which a fragment of the chromosome is removed.

Down Syndrome

General set of symptoms in people with Trisomy 21.


Change to a chromosome in which part of the chromosome is repeated


Change to a chromosome in which a fragment of the original chromosome is reversed.


Event during meiosis in which homologous chromosomes or sister chromatids fail to separate.


Family tree that records and traces the occurence of a trait in a family.


Change to a chromosome in which a fragment of one chromosome attaches to a nonhomologous chromosome.

Trisomy 21

Condition in which an individual has three numer 21 chromosomes, resulting in Down Syndrome.

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