Bulletin Volume 155-163

Bulletin Volume 155-163

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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. 1915 edition. Excerpt: ...that the pigment was not black or dun, and that the color was really yellow as would be expected. ( cT 925 A--Bbii--black 8. 2 4 13 ( 9 904 A--bbii--yellow The inclusion of a factor in parentheses in a formula indicates uncertainty as to its presence. Below are shown the F2 results of matings of Fi birds from blackyellow crosses. The first pair are two of the five Ft blacks produced in mating No. 3 of Table XIV. The second pair are a black and a dun from mating No. 6 of the same table. The blacks being heterozygous for both B and / and the dun for B, all four classes of young were to be expected. d-862 A-BbIi-black J J black dun red yellow 9 862 2, -ZftK-bIack Pr0dUCed 8 1 o" 841 A--BbIi--black------: produced 1111 9 799 B--Bbii--dun y Red to yellow gives all red when the red parent is homozygous for/. o" 1 A--bbII--red produced 9 offspring, all red. 9 4 A--bbii--yellow If the red parent is heterozygous for I, both red and yellow offspring are obtained. Three such matings gave a total of 14 red to 9 yellow. A single mating may be given by way of illustration. d-656B-66/i-red red yellow-----------produced 4 4 9 709 A--bbii--yellow Reds and yellow are produced also when both parents are red and heterozygous for intensity. cf725A-/t-red, a red yeUow-------rz--. r produced 5 1 9 726 A--bbIi--red v When red and dun are crossed one dominant character is brought in from each parent and the resulting offspring are accordingly all black, provided the parents were homozygous. If the red parent is heterozygous for intensity both black and dun birds will occur in the progeny. Both these conditions are illustrated in the following matings. & i A-bbII-red, blck dun--, --produced 7 0 9 903 A--BBii--dun y cf 540 B--BBii--dun...
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Product details

  • Paperback | 112 pages
  • 189 x 246 x 6mm | 213g
  • United States
  • English
  • black & white illustrations
  • 1236804848
  • 9781236804846