BIO121ch16

BIO121ch16 - BIO121 I. Chapter 16. A. Karyotype A.1. Number...

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BIO121 I. Chapter 16. A. Karyotype A.1. Number and kinds of chromosomes B. Aneuploidy B.1. Trisomy B.1.a) One extra chromosome (3 in one set) B.1.b) Trisomy 21 ( Downs syndrome) B.2. Misomy? C. Nondisjunction C.1. Sister chromatids or homologous chromosomes fail to move apart properly. D. Translocation D.1. Part of one chromosome becomes attached to another chromosome D.1.a) In Down Syndrome, part of chromosme 21 may be attached to chromosome 14 E. Deletion E.1. Chromosome breaks, fails to rejoin. E.1.a) Deletion ranges from a few base pairs to an entire chromosome arm E.2. Cri du chat syndrome E.2.a) Part of chromosome 5 is deleted F. Fragile Sites F.1. Occur at specific locations on both chromatids of a chromosome F.2. Fragile X Syndrome F.2.a) Occurs near tip of X chromosome F.2.b) Nucleotide triplet CGG repeated many times F.2.c) Common cause of inherited mental retardation G. Pedigree G.1. A “Family Tree” G.1.a) Shows transmissions of genetic traits in a family over several generations
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BIO121ch16 - BIO121 I. Chapter 16. A. Karyotype A.1. Number...

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