Three distinct alleles control the size of the sunflower. These genes are located at three distinct loci on the chromosome.
A sunflower plant's flower size is influenced in part by the expression of all of these genes. Quantitative or polygenic inheritance refers to this kind of gene interaction.
In polygenic legacy, the aggregate is really the 'combined' articulation of all the dominant alleles of the qualities required for a specific characteristic. These traits are referred to as polygenic traits, and these genes are referred to as polygenes.
The number of genotypes is determined by using the formula 3n, and the number of phenotypes is determined by using the formula (2n+1). n is the number of involved polygenes.
Given that the F2 generation possesses seven phenotypes, the following is the number of polygenes involved:
2n+1= 7
2n = 6
n = 3
Hence this sunflower strain's flower size is controlled by three polygenes.
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