What else about Genetics

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What else about Genetics???
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HUMAN SKIN COLORwhat type of dominance is it???
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HUMAN EYE COLORwhat type of dominance is it???
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Human skin color eye color are
examples of POLYGENIC TRAITS.
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POLYGENIC TRAITS

• traits that are controlled by more than one pair
  of genes

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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.)

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NON-DISJUNCTION

• The failure of chromosomes to separate correctly
  during meiosis

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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