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10 Cards in this Set
- Front
- Back
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ABO blood group
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Three alleles of a gene that determines which if any antigens are produced on the surface of red blood cells. Alleles A and B are codominant; O is recessive and means no antigens are produced.
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Hemophilia
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inability to control blood clotting.
X-linked recessive. Much more common in males than females |
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Color blindness
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Inability to distinguish certain colors.
X-linked recessive. Much more common in males than females |
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Huntington's disease
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Mental deterioration and uncontrollable movements; death in middle age.
Autosomal dominant |
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Tay-Sachs disease
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Lipid accumulation in brain; mental retardation; blindness; death in early childhood.
Autosomal recessive |
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Sickle-cell disease
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Misshapen red blood cells; damage to many tissues
Co-dominant alleles |
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Down syndrome
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Mental retardation; increased susceptibility to many diseases; high frequency of birth defects
Caused by an extra copy of chromosome 21 ("trisomy 21") |
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Cystic fibrosis
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Excess mucus in lungs, liver, digestive tract. Increased susceptibility to infections
Autosomal recessive |
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Klinefelter syndrome
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In males, an extra copy of the X chromosome (karyotype 47, XXY). Usually causes sterility. Caused by nondisjunction of the X chromosome.
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Turner syndrome
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sterile females with only one copy of the X chromosome; no sexual development at puberty
Caused by nondisjunction of the X chromosome (karyotype 45,X) |
