Fundementals of Plant Breeding

Fundementals of Plant Breeding

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ... factors for the cob and for the seed are usually handed Fig. 58.--Red cob and seed separated in inheritance (F generation): ears 1 and like parents, are pure types; ears 2 and 3 are heterozygous.--After East. really two factors coupled together, and not one factor. Emerson produced races with red seed and white cob, and vice versa (Fig. 58), showing that these two features are not necessarily linked together. There are also cases of what are called blends, which may result either from incomplete dominance or from the absence of any dominance. For example, it happens in the crossing of certain purple and white races of maize that the hybrid progeny has pinkish grains, which means an incomplete dominance of the purple. The classic illustration and the best one of blends is obtained from Andalusian fowls. There is a blue type of this race of fowls that never breeds true, and of course remained for a long time a puzzle to poultry fanciers. It was found that if two blue fowls were mated, only one-half of the progeny was blue, onefourth being black, and the other fourth splashed white. The black and white strains breed true, and when black and white strains are crossed all of the progeny are blue. This led to what was called the paradox in the case of this inheritance, namely, that black crossed with white produces twice as many blues as blue crossed with blue. This simply means that blue is not a character represented by a determiner, but appears only by bringing black and white together with no dominance of either. These are simple illustrations of the complications that arise, so that, although the fundamental law of heredity is simple, the interpretation of many cases becomes difficult. SUMMARY Mendel's experiments dealt with very more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • United States
  • English
  • black & white illustrations
  • 1236905822
  • 9781236905826