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Bateson & Punnett and sweet peas:

F 1 : RrLl Purple flowers Long pollen. F 2 : Total of 381 offspring. P 1 : RRLL x rrll. Purple flowers Red flowers Long pollen Round pollen. Chapter 5: Linkage and Gene Mapping. Bateson & Punnett and sweet peas:. Linkage and Gene Mapping.

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Bateson & Punnett and sweet peas:

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  1. F1: RrLl Purple flowers Long pollen F2: Total of 381 offspring P1: RRLL x rrll Purple flowers Red flowers Long pollen Round pollen Chapter 5: Linkage and Gene Mapping Bateson & Punnett and sweet peas:

  2. Linkage and Gene Mapping *Independent assortment- during gamete formation segregating pairs of unit factors assort independently of one another *Linkage – condition in which two or more genes tend to be inherited together

  3. NP 100 TOTAL An example of linkage: Crossover results in gametes containing non-parental (NP) genotypes: R L r l r l r l X RrLl rrll Progeny: *Complete linkage *Linkage ratio

  4. R L Even if CO occurs 100% of the time, recombination is only observed in ½ of the gametes (or 50%) Chromosome Mapping Frequency of recombinants (RF) measures the genetic distance between loci 11 m.u. Theoretical limit to distance between genes is 50m.u.

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