In this question how did we use 15 and why? Explain experts

Dear student,
Please find below the answer:

In some plants, height is a polygenic character. This means it is controlled by multiple genes. It is the presence of dominant alleles that decide the increase in height. The more the dominant alleles, the more will be the height of a plant.

In the question, it is given that height is controlled by three pairs of genes (6 alleles). According to the values, the maximum height given is 190 cm and the minimum height is 100 cm.  

​​​​​​Therefore, each dominant allele contributes = Maximum-Minimum/No. of alleles
                                                                      =190-100/6 = 15 

Hope this information clears your doubt.
Regards.
 

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