Presentation on theme: "G-typesPhenotypesExp.Exp.#Observed# R_L_Purple flowers, long pollen9215284 R_llPurple flowers, round pollen37121 rrL_Red flowers, long pollen37121 rrllRed."— Presentation transcript:
G-typesPhenotypesExp.Exp.#Observed# R_L_Purple flowers, long pollen9215284 R_llPurple flowers, round pollen37121 rrL_Red flowers, long pollen37121 rrllRed flowers, round pollen12455 Bateson & Punnett and sweet peas: P 1 : RRLL x rrll Purple flowersRed flowers Long pollenRound pollen F 1 : RrLl Purple flowers Long pollen F 2 : Total of 381 offspring Chapter 5: Linkage and Gene Mapping
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
An example of linkage: Purple, long42 Purple, round6 Red, long4 Red, round48 Progeny: 100 TOTAL NP R L r l X RrLlrrll Crossover results in gametes containing non-parental (NP) genotypes: *Complete linkage *Linkage ratio
Chromosome Mapping Frequency of recombinants (RF) measures the genetic distance between loci LR 11 m.u. Theoretical limit to distance between genes is 50m.u. Even if CO occurs 100% of the time, recombination is only observed in ½ of the gametes (or 50%)
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