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Gene Linkage and Mapping
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Remember Mendel’s Laws
Law of Segregation Alleles for a trait will separate independently from each other during gamete formation Law of Independent Assortment Homologous chromosomes will separate independently from other homologous chromosomes
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Linked Genes A1, B1 & C1 are linked genes
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Crossing over can UNLINK genes!
Recombinants
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higher rate of crossing over Genes further apart
Less likely to be linked = = Linked Not linked
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Purple (R) is dominant over red (r)
RRLL x rrll Purple (R) is dominant over red (r) Long pollen (L) is dominant over round pollen (l) RrLl
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RrLl
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RrLl The law of independent assortment does not always apply with linked genes
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