A) bombarding the seeds with DNA
B) crossing of two inbred parental lines
C) harvesting seeds from the most productive plants
D) inducing mutations
Correct Answer: B
Solution :
Hybrid varieties were first developed in maize, which is a cross pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines. A inbred line is a nearly homozygous line produced by continuous inbreeding in a cross-pollinated crop and is maintained by strict inbreeding. In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines.
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