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  4. What proportion of offsprings in the F2 generation of a tetrahybrid cross will resemble the phenotype of parents that produce the F1 hybrid?

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Q. What proportion of offsprings in the $F_{2}$ generation of a tetrahybrid cross will resemble the phenotype of parents that produce the F1 hybrid?

NTA AbhyasNTA Abhyas 2022

Solution:

The total number of offsprings in the F2 generation is represented by 4n, where n = 1 for monohybrid, n = 2 for dihybrid, etc. Thus the total number of offsprings in the F2 generation of tetrahybrid cross is 44 = 256. Out of these only two offsprings will resemble the parents genotypically. Thus their proportion is 2/256, which is 1/128.