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Chapter 12 Vocabulary

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Carrier
Individual who has one copy of the allele for a recessive disorder and does not exhibit symptoms.
Deletion
Change to a chromosome in which a fragment of the chromosome is removed.
Down Syndrome
General set of symptoms in people with Trisomy 21.
Duplication
Change to a chromosome in which part of the chromosome is repeated
Inversion
Change to a chromosome in which a fragment of the original chromosome is reversed.
Non-disjunction
Event during meiosis in which homologous chromosomes or sister chromatids fail to separate.
Pedigree
Family tree that records and traces the occurence of a trait in a family.
Translocation
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.