What causes heterosis, the extra vigour of hybrid crops?

Explain why hybrid crops outperform their parents, and use that understanding to breed better hybrids or fix hybrid vigour in seed.

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1	{
2	"domain": "life-health",
3	"topics": [
4	"agriculture",
5	"plant-science"
6	],
7	"kind": "question",
8	"source": {
9	"key": "agriculture-100",
10	"name": "100 essential questions for the future of agriculture",
11	"url": "https://doi.org/10.1002/moda.5",
12	"id": "23",
13	"curator": "Hu et al.",
14	"poser": "Hu et al.",
15	"status": "open question (2023 agenda)",
16	"as_of": "2026-10-20",
17	"catalog": "0521c19bbd38"
18	},
19	"review": true,
20	"approval": "first-time"
21	}