. The cotton plant in Egypt, studies in physiology and genetics. Cotton; Cotton. IX HEREDITY 167 The weight of the seed.—The inheritance of the mean seed-weight is particularly interesting. In the first place it fluctuates more than any other character, except- ing the height, and it further shows clear evidence of autogenous fluctuation. The first cross in which this character was carefully examined was Afifi x Truitt (Fig. 66), where the mean seed weights were 0-105 g. and 0-135 g. The seed weight in Fj was 0"165 g. In Fa the weights ranged from O'OS to 0'175 g., with two marked modes a
. The cotton plant in Egypt, studies in physiology and genetics. Cotton; Cotton. IX HEREDITY 167 The weight of the seed.—The inheritance of the mean seed-weight is particularly interesting. In the first place it fluctuates more than any other character, except- ing the height, and it further shows clear evidence of autogenous fluctuation. The first cross in which this character was carefully examined was Afifi x Truitt (Fig. 66), where the mean seed weights were 0-105 g. and 0-135 g. The seed weight in Fj was 0"165 g. In Fa the weights ranged from O'OS to 0'175 g., with two marked modes at 0-095 and 0-115. The form of this Fj graph suggested that light seed was 10. - f, F16. 66.—Mean Seed-Wbight. Afifi X Truitt, showing extraction of small seed in Fg. segregating from heavy seed, and on testing this by breed- ing on, we found no reason to modify this conclusion; thus, a plant with seed weighing 0-100 regressed slightly in F3 to a mean of 0-090, with a scatter from 0-070 to 0-110, and no higher probable error than the parent strain ; and F4 raised from a 0-090 plant of these gave the same result, ranging from 0-065 to 0-110. The plants of the F4 had been extremely diversified in most other characters, such as height, while the F4 was almost a pure strain. Whether the segregation was simple or compound, it was clear that the size of the seed—expressed by us as weight—was an inherited characteristic. In another cross, namely Charara x King (Fig. 68), the matter became more interesting, and the inheritance. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Balls, William Lawrence, 1882-. London, Macmillan and Co. , Ltd.
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