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Genetic Diagrams
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In genetic diagrams letters are used to represent or show the alleles
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Dominant alleles are shown as a capital letter (e
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'C') and recessive alleles are shown
as a small letter (e
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'c')
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If the two alleles for a particular gene (e
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hair colour) are the same then the organism is
homozygous
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If the two alleles for the same gene are different then the organism is heterozygous
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To display a dominant characteristic the organism can either be CC or Cc
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QI
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The gene that makes the hamster crazy is recessive (h) so the crazy hamster must have the genotype hh
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The normal hamster could have the
genotypes HH or Hh
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allele, so although normal they are also called 'carriers'