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Complete Dominance
Incomplete Dominance
Monohybrid Cross: Ww x Ww
(Ww=widows peak; ww=no peak)
Sickle Cell Anemia Trait Cross: Ss x Ss
(SS = no sickle cell; Ss = sickle trait;
ss = sickle cell disease)
Genotypic Ratio:
Genotypic Ratio:
Phenotypic Ratio:
Phenotypic Ratio:
Complete Dominance
Incomplete Dominance
PTC Taster Cross: TT x tt
(TT or Tt = taster; tt = nontaster
Familial Hypercholesterolemia
Cross: Ff x ff (ff = normal cholesterol;
Ff = high chol.; FF = very high chol.)
Genotypic Ratio:
Genotypic Ratio:
Phenotypic Ratio:
Phenotypic Ratio:
Autosomal Dominant Disorder
Autosomal Recessive Disorder
(Huntington’s Disease) Cross: = Hh x hh
(Hh=Huntington’s; hh= no Huntington’s.)
(PKU) Cross: Pp x Pp
(Pp = no PKU; pp = PKU)
Genotypic ratio:
Genotypic Ratio:
Phenotypic Ratio:
Phenotypic Ratio:
Multiple Alleles (ABO blood type)
Sex-Linked Inheritance
Cross: Ao x Bo
(Ao = Type A; Bo = Type B)
(Color-blindness) Cross: XBXb x XbY
(XBXb = Female carrier w/ color vision;
XbY = Colorblind male)
Genotypic Ratio:
Genotypic Ratio:
Phenotypic Ratio:
Phenotypic Ratio:
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