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GENETIC DISORDERS
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DOMINANT AUTOSOMAL HEREDITY
A single dominant autosomal allele is inherited from one parent causing the person to show the dominant trait Huntington’s Disease- lethal genetic disorder caused by autosomal dominant allele. Degeneration of the nervous system in ages Passed to the offspring.
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RECESSIVE AUTOSOMAL HEREDITY
Most genetic disorders are caused by recessive genes
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CYSTIC FIBROSIS White Americans Mucus in the lungs and digestive tract
The thick mucus collects in the lungs
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SICKLE CELL ANEMIA Most common in black and Mediterranean population
Red blood cells are sickle shaped Suffers from anemia and clogged blood vessels
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TAY SACHS DISEASE Absence of an enzyme that breaks down a lipid produced by the Central Nervous System Mental deterioration, die by age 4 Common in Ashkenazi Jewish population
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PHENYLKETONURIA (PKU)
Absence of an enzyme that converts phenylalanine to tyrosine Accumulates in the body Causes CNS damage & mental retardation Special Diet will prevent symptoms
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SEX LINKED DISORDERS Genes that are only carried on the sex chromosomes (X,Y) X-linked are passed to daughters & sons (generally females are only carriers) Y-linked are passed only to the sons
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COLOR BLINDNESS Caused by the inheritance of 2 recessive alleles on the X chromosome Red-Green, Blue-Yellow, or Complete
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HEMOPHILIA X-linked disorder
Blood does not clot, missing a clotting factor
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Queen Victoria England
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ANEUPLOIDY Abnormal number of chromosomes
Down Syndrome- 3 chromosomes on the 21st pair Turner Syndrome- female with only one X chromosome Klinefelter’s- Male with XXY
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Down Syndrome
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Turner Syndrome
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Klinefelter’s Syndrome
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Some other genetic disorders!
Progeria Albinism
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Dwarfism
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Muscular Dystrophy
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Retinoblastoma
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Marfan Syndrome
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Lesch Nyhan Syndrome
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Shortest man: 21 in., tallest 8 ft 3 in
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