Single Choice

Number of genotypes produced when individuals of genotype 'YyRrTt' are crossed with each other is

A4
B45
C28
D27
Correct Answer

Solution

Number of genotypes produced when individuals of genotype 'YyRrTt' are crossed with each other is 27.
Number of genotypes produced can be calculated by n x n x n; where 'n' is the number of alleles in the given genotype. In the given question, there are three types of alleles which shows that n = 3.
Therefore the number of genotypes produced when YyRrTt = 3x3x3 = 27.
In detail:

YyRrTt x YyRrTt
Gametes: YRT, YRt, Yrt, yRT, yRt, yrt YRT, YRt, Yrt, yRT, yRt, yrt
Individuals formed : F1 generation - 27 types

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