In trihybrid, when all gene show complete linkage then what is the ratio of test cross?

1 : 1 : 1 : 1 : 1 : 1 : 1 : 1

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1 : 1

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1 : 1 : 1 : 1

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9 : 3 : 3 : 1

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Solution

The correct option is B 1 : 1
A trihybrid cross is between two individuals that are heterozygous for three different traits. For example, RrYyCc x RrYyCc is a trihybrid cross where,
RR = round, Rr = round, rr = wrinkled
YY = green, Yy = green, yy = yellow
CC = smooth, Cc = smooth, cc = constricted
The complete linkage is when genes are so closely associated that they are always transmitted together, and that does not undergo crossing over.
So, in this case, the ratio of test cross for trihybrid with complete linkage will be 1:1.
Thus, the correct answer is '1:1'.

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