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  4. In a trihybrid cross, the different types of genotypes obtained in the F2 generation is

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Q. In a trihybrid cross, the different types of genotypes obtained in the F2 generation is

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

In a monohybrid cross, there are 3 types of genotypes produced in the F2 generation: AA, Aa, aa. In a dihybrid cross, there are $3\times 3=9$ types of genotypes produced in the F2 generation: AABB, AaBB, aaBB, AABb, AaBb, aaBb, AAbb, Aabb, aabb. In a trihybrid cross, there are $3\times 3\times 3= \, 27$ types of genotypes produced in the F2 generation (number of different F2 genotypes is 3n) and they are: AABBCC, AaBBCC, aaBBCC, AABbCC, AaBbCC, aaBbCC, AAbbCC, AabbCC, aabbCC, AABBCc, AaBBCc, aaBBCc, AABbCc, AaBbCc, aaBbCc, AAbbCc, AabbCc, aabbCc, AABBcc, AaBBcc, aaBBcc, AABbcc, AaBbcc, aaBbcc, AAbbcc, Aabbcc, aabbcc.