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A farmer wants a wheat variety with a much higher grain yield. How long does selective breeding for this take?

  1. One cross, since the offspring inherit the wanted characteristic directly
  2. Many generations of choosing and breeding the best plantsՃիշտ պատասխան
  3. One growing season, provided enough plants are crossed
  4. It cannot be done at all, because yield is not inherited

Բացատրություն

Each round of breeding shifts the population only a little towards the wanted characteristic, because the chosen parents still carry alleles for lower yields and hand them on as well. Repeating the choice over many rounds gradually makes the helpful alleles common enough for the variety to breed true.

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