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Patterns of Inheritance
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Dominant Vs. Recessive Dominant gene will always be displayed Recessive gene can “Skip” Generations Need 2 copies of recessive gene to be expressed
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Incomplete dominance Blood type only 3 alleles for blood type (I A, I B, and i) A and B are co-dominant i is recessive Also has a Rh factor + or – Type A I A I A i Type AB I A I B Type B I B I B i Type O ii i
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Rh + Rh Antigen O+O+ A+A+ B+B+ AB + *Universal Acceptor Rh- No Rh Antigen O - *Universal Donor A-A- B-B- AB -
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Additive Alleles In some species flower color or skin color is the result of additive alleles The A allele produces a red pigment The a allele produces no pigment The Heterozygous Aa shows an intermediate color
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Multiple additive alleles Skin color can be the result of multiple alleles That is why there is such variation within a population Each Capital Letter Allele produces a pigment, while each lower case does not Gametes ABC ABc AbC Abc aBC aBc abC abc ABC65545443 ABc54434332 AbC54434332 Abc43323221 aBC54434332 aBc43323221 abC43323221 abc32212110
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Some genes are Sex-Linked Hemophilia (blood does not clot) Red-Green Color Blindness Recessive genes carried on the X Chromosome
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More examples http://www.biologycorner.com/bio4/notes/beyond_mendel.php
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