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What else about Genetics

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... of chromosomes (Downs Syndrome, Klinefelter's, etc.) NON-DISJUNCTION ... Downs Syndrome (Trisomy 21) Patau Syndrome (Trisomy 13) Klinefelter's (Trisomy 23)- XXY ... – PowerPoint PPT presentation

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Title: What else about Genetics


1
What else about Genetics???
2
HUMAN SKIN COLORwhat type of dominance is it???
3
HUMAN EYE COLORwhat type of dominance is it???
4
Human skin color eye color are
examples of POLYGENIC TRAITS.
5
POLYGENIC TRAITS
  • traits that are controlled by more than one pair
    of genes

6
(No Transcript)
7
CAUSES OF GENETIC DISEASES
  • a recessive allele
  • ex. HemophiliaXHXH, XHXh, XhXh
  • a dominant allele
  • ex. some kinds of dwarfismDD or Dd
  • Non-disjunction of chromosomes (Downs Syndrome,
    Klinefelters, etc.)

8
NON-DISJUNCTION
  • The failure of chromosomes to separate correctly
    during meiosis

9
Common Diseases Due to Non-Disjunction
  • Downs Syndrome (Trisomy 21)
  • Patau Syndrome (Trisomy 13)
  • Klinefelters (Trisomy 23)- XXY
  • Jacobs Syndrome (Trisomy 23)- XYY
  • Turner Syndrome (Monosomy 23)- X
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