chapter 15 – the chromosomal basis of inheritance
Post on 03-Jan-2016
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Chapter 15 – The Chromosomal Basis of Inheritance. Sex Determination. Sex-linked genes. Sex linked inheritance. Must show sex chromosomes Hemizygous. X inactivation. Barr body. Linked genes. Nondisjunction. Aneuploidy Monosomy Trisomy. Down syndrome. Trisomies in sex chromosomes. - PowerPoint PPT Presentation
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Chapter 15 – The Chromosomal Basis of Inheritance
Sex Determination
Sex-linked genes
Sex linked inheritance
• Must show sex chromosomes
• Hemizygous
X inactivation
• Barr body
Linked genes
Nondisjunction
• Aneuploidy
– Monosomy
– Trisomy
Down syndrome
Trisomies in sex chromosomes
• Klinefelter syndrome 47, XXY
• Jacob syndrome 47, XYY
• TriploX 47, XXX
Monosomy in sex chromosome
• Turner syndrome 45, XO
Chromosome structural abnormalities • Deletion
• Duplication
Chromosome structural abnormalities cont
• Inversion
• Translocation
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