monohybrid cross does not always show 3:1 phenotypic ratio explain with example
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Answer:
A cross between two types of plants of the same species considering only the transmission of one character is called monohybrid cross. Generally phenotypic ratio is 3:1, but in some cases it may be different like in case of incomplete dominance, codominance etc. I am explaining here the incomplete dominance in the dog flower.
Dog flower also called Snapdragon or Antirrhinum species. In a cross, between true-breeding red-flowered (RR) and true-breeding white-flowered plants (rr), the F1 generation obtained (Rr) was pink colored. When progeny obtained in F1 generation was self-pollinated, the resulting F2 generation was as :
1 Red(RR) : 2Pink(Rr) : 1White(rr)
Here the genotype ratios were exactly as in the Mendelian monohybrid cross, but the phenotype ratios changed from the 3:1 to 1:2:1
You can understand the cross easily with the ffigure:
