Researchers at a health food company decide to breed sunflowers with larger seeds, thinking they might be more popular if people could eat them like pistachios. They choose a set of seeds 4 mm longer than average and grow them to maturity. They cover the flowers so that bees and other pollinators can't reach them and cross-pollinate them by hand. When they harvest the seeds of the new plants, they find them to be on average 1 mm longer than the original population mean. What is the heritability of seed length in this experiment? 100% 50% 25% 10% 0%

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