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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.
The post What is a monohybrid Cross? appeared first on Essay Conect.
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