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Plant Breeding
Beginning of essay
Mankind has selectively bred plants for thousands of years with the
aim of improving their quality. Experimenting with cereal crops, breeders
have aimed to enhance their yield of grain, the quality of their flour, and
their resistance to disease and drought. With other plants, breeders have
tried ....
Middle of essay
....ybrid species was made in 1927 by the
Russian geneticist G. D. Karpechenko, who crossbred two quite distantly
related species, a radish and a cabbage. Each species has eighteen
chromosomes (nine pairs); the hybrids had the same number (nine radish
chromosomes and nine cabbage chromosomes) and were sterile. However, some
polyploids arose by chance. These had thirty six chromosomes (nine pairs
of radish, and nine pairs of cabbage), and were fertile. Unfortunately,
the hybrid was not commerciall.... |
| Number of words: 622 |
Approximate pages: 3 |
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