http://www.whataboutwatermelon.com/index.php/2010/09/the-truth-about-seedless-watermelon/

THE TRUTH ABOUT SEEDLESS WATERMELON

National Watermelon Promotion Board explains that A seedless watermelon is a sterile hybrid, created by crossing male pollen for a watermelon, containing 22 chromosomes per cell, with a female watermelon flower with 44 chromosomes per cell. When this seeded fruit matures, the small, white seed coats inside contain 33 chromosomes, rendering it sterile and incapable of producing seeds. 

Seedless watermelons are considered as a younger relative of the traditional seeded watermelon. Despite being new, the seedless watermelon actually outsells its seeded peers by a significant margin. According to the National Watermelon Promotion Board, only 16 percent of watermelon sold in grocery stores has seeds. In 2003, that number was 43 percent. 

-This shows that these genetically modified watermelons are safe for human consumption and are gradually being accepted and favoured by the general public, refuting arguments that food that are genetically altered are unsafe to be consumed by humans.