Gene Linkage and Mapping

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Gene Linkage and Mapping

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

Linked Genes A1, B1 & C1 are linked genes

Crossing over can UNLINK genes! Recombinants

higher rate of crossing over Genes further apart Less likely to be linked = = Linked Not linked

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

RrLl

RrLl The law of independent assortment does not always apply with linked genes

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