Wild-Type Arabidopsis Has Five Chromosomes (2n = 10)

Multiple Choice

Wild-type Arabidopsis has five chromosomes (2n = 10) .Trisomic plants are designated as Tr followed by the trisomic chromosome number-that is, Tr1 is trisomic for chromosome 1.Assuming that trisomy is fully viable and that all possible pairing configurations (including nonpairing) are possible at meiosis, what proportion of the progeny from the cross wt × Tr1;Tr2 will have a wild-type chromosomal complement?

A) 1/2
B) 1/3
C) 1/4
D) 1/9
E) 1/81