Legislative Documents Volume 20, No. 59, PT. 3 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...203, 205, 206, and 208 were all made between magentas and pinks, and in every case the Fi plants were all magentas. When selfed, these Fi magentas gave an F2 progeny comprising magentas, mauves, and pinks. The absence of the gene B in either parent precluded, of course, the appearance of any of the blue series in any generation subsequent to the cross. The fact that the genes C and R gwere intact in both parental types, according to theory, precluded the appearance of tinged whites or plain whites. Magenta, bearing genes for greater intensification of color than mauve, would be dominant to it, as was found to be the case, and in the recombination of genes when Fi plants were selfed, there would be produced such recombinations as would give rise to the three red types and to intervening gradations of color which are difficult to classify as either the one or the other. Mauve crossed with light blue.--Four crosses were recorded between mauve and light blue. The Fi offspring were dark blues, light blues, and mauves; the F2 plants were dark blues, light blues, mauves, and pinks. According to hypothesis, if a mauve is crossed with a blue the gene B will be brought into the zygotic combination of Fi, and, this being dominant to the genes of the red series, only blue could result. If the light blue parent were simplex for B, some mauves could appear in Fi as follows: Fi CCRRbbXX mauve X CCRR CCRRBbXx light blue. Mauve crossed with dark blue.--Crosses 212 and 213 were made between mauve and dark blue, and in Fi gave only dark blues. They split up in F2 into dark blues and mauves. The numbers were very small, and, had more plants been produced, it is possible that other types might have made their appearance; but it is unlikely that any other types would have appear...