You cross a yyttrrss to a yyttrrss. what percent of offsprings will be yyttrrss?
a) 1/256
b) 2/256
d) 3/4
c) 0

A) 1/256

Explanation:

Parent 1 : YyTtRrSs

Parent 2: YyTtRrSs

Probability of a YY offspring occurring in a cross between Yy and Yy = 1/4

Probability of a TT offspring occurring in a cross between Tt and Tt = 1/4

Probability of a RR offspring occurring in a cross between Rr and Rr = 1/4

Probability of a SS offspring occurring in a cross between Ss and Ss = 1/4

Total probability of YYTTRRSS =

1/4 * 1/4 * 1/4 * 1/4 = 1/256

Hence, 1/256 of offspring will be YYTTRRSS

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