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The expected 9:3:3:1 ratio of dihybrid genotypes is altered with linkage. ###### Parental | | AB | ab | |---|---|---| | AB | AABB | AaBb | | ab | AaBb | aabb | ###### 1/4 | | AB | ab | |---|---|---| | AB | AABB | AaBb | | ab | AaBb | aabb | ###### Recombination 1/4 | | AB | ab | |---|---|---| | A...

The expected 9:3:3:1 ratio of dihybrid genotypes is altered with linkage. ###### Parental | | AB | ab | |---|---|---| | AB | AABB | AaBb | | ab | AaBb | aabb | ###### 1/4 | | AB | ab | |---|---|---| | AB | AABB | AaBb | | ab | AaBb | aabb | ###### Recombination 1/4 | | AB | ab | |---|---|---| | Ab | AABb | Aabb | | aB | AaBB | aaBb | ###### 1/4 | | AB | ab | |---|---|---| | | ABB | aabb | | | AabB | aaBb | ~Recombination is a result of crossing-over during meiosis.~ * H. Creighton, B. McClintock, and C. Stern in 1931 showed that genetic recombination depends on reciprocal exchange of chromosomes. * Physical markers are structural distinctions used to identify specific chromosomes * Genetic markers, alleles used as points of reference for recombination.