Wild-Type Arabidopsis Has 5 Chromosomes (2n = 10)

Wild-type Arabidopsis has 5 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 Tr1 × Tr1 will have a wild-type chromosomal complement?

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