Discussion
In watermelons, to induce seedlessness in triploid population, which of the following strategies is useful ?
Answer: D
Seedless triploids are produced by crossing tetraploids with diploids.
A tetraploid (4n) watermelon, made by colchicine treatment, is used as the female parent and crossed with a diploid (2n). The 2n egg and n pollen give a triploid (3n) seed. Triploid plants are sterile because three sets of chromosomes cannot pair evenly in meiosis, so their fruits develop without mature seeds when pollinated by a diploid pollinator.
Triploids are themselves sterile, so self-pollinating them or crossing two triploids does not give a useful population, and selecting for unreduced gametes would raise ploidy, not secure seedlessness.
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