29 Jun The crossing of two heterozygotes for one trait. ##Aa xx A
The crossing of two heterozygotes for one trait. ##Aa xx Aa## It always yields a genotypic ratio of 1:2:1 AA:Aa:aa (homozygous dominant:heterozygous:homozygous recessive.). In mendelian genetics It always yields a phenotypic ratio of 3:1 dominant trait:recessive trait. It is not to be confused with a dihybrid cross which involves crossing two heterozygotes for two traits (##AaBb xx AaBb##) The genotypic ratio is always the same (1:2:1) but the phenotypes are sometimes different. If the alleles are incompletely dominant the phenotypic ratio will be 1:2:1. An example is red and white roses. RR is red WW is white but RW is pink a third phenotype just for heterozygotes. The same is true for codominant alleles except the phenotypes are both expressed rather than mixed.
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