Table 1 shows some characteristics of two varieties of maize.
| Variety of maize | Resistance to stem borer insects | Crop yield (grain weight) |
|---|---|---|
| Zea-A | High | Low |
| Zea-B | Low | High |
Describe how a farmer could selectively breed these two varieties of maize to produce a new variety of maize that is resistant to stem borer insects and has a high crop yield.
