Question

In rice, assume that a recessive gene "a” is responsible for resistance to BLB. This gene is present on chromosome #1. A monosomic resistant line for chromosome #1 is crossed with normal susceptible line. The phenotype of F1 plants will be

A all plants resistant
B all plants susceptible
C 50% plants resistant and 50% plants susceptible
D 75% plants resistant and 25% plants susceptible
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