By H. De Haan

Even with the numerous guides that have seemed of past due years at the heredity within the pea, yet the various hereditary variations were analysed, whereas the study at the localization of the standards remains to be in its preliminary level. So the pea of which such a lot of types happen, in the meanwhile offers lots of fabric to begin a examine. i've got set myself the duty of creating the completest attainable research of the flower color changes and of the diversities in size of stem. As regards the flower color I construct at the researches of H. TEDIN, who was once type sufficient to spare me his kinds for my learn. In a manner it's a chuffed accident that the variety of flower colors of the pea is quite small, which renders the learn surveyable. Of the recognized varieties I now own a reasonably whole assortment, pains being regularly taken to complement the gathering. The examine at the heredity of the size of stem continues to be in its preliminary level. So tremendous a couple of types exist that i've got extra fabric at my disposal than will be labored up. The researches have been made within the Genetic Institute of the kingdom college of Groningen.

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Nor do somatic differences occur in one and the same plant. Purple dotted 352 H. DE HAAN, CONTRIBUTIONS TO THE GENETICS OF PI SUM may, therefore, be considered a dotted colour pattern, all constituent parts of which are genetically identical. TABLE 17. Self-pollination purple dotted year 1927 1929 1930 No. 7la 311 319 136 137 138 139 140 141 142 142a 138a 137 total purple dotted 25 49 29 34 30 35 33 34 35 35 35 86 43 503 § 7. The 'white' plants In the description of the purple patched forms it has been pointed out that the pattern may vary greatly, that is from almost white ('white') to entirely purple.

TABLE 34. year No. 207 From this appears a segregation into 3 purple: 1 purple dotted, so that we may conclude to a monofactorial difference. As both between purple and white, purple and purple dotted, and white and purple dotted a monofactorial difference exists, we may conclude to multiple allelomorphism. In accordance with this is our previous hypothesis that the factor for purple dotted is allelomorphic with A. This factor was called A 2 • (It is true A z was originally used by W:ELLENSIEK for 1 of the colour factors, but it was subsequently abolished (the TEDINS and WELLENSIEK, 84, 1925, p.

The purple branches of which the leaf axil is purple dotted are to be taken as periclinal chimeras, of which the core is purple dotted and the epidermal skin purple. The branches on the Fl plant with a purple dotted leaf axil colour segregate into 3 purple dotted: 1 white, while the branches with a purple leaf axil colour segregate into 3 purple: 1 white. From this it appears that from the 365 PATCHED AND DOTTED FLOWERS purple dotted Fl plant branches have developed of the genetic constitution Aa.

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