. The physical basis of heredity . Fig. 10.—Relation of tall to short peas as shown bj Fi classes. group: Here the tall and the heterozygous group arealike, and inseparable by ordinary inspection, even atthe extreme end of their variation curves, and short is completely recessive. In cases in which the environment enters moreobviously into the result (as in abnormal abdomen, ), the following scheme (Fig. 11) represents the relation:. Dry Wet Fia. 11.—Relation of normal to abnormal abdomen as shown by classes of Fi flies. Drysignifies conditions that make for normal; wet for abnormal. In t
. The physical basis of heredity . Fig. 10.—Relation of tall to short peas as shown bj Fi classes. group: Here the tall and the heterozygous group arealike, and inseparable by ordinary inspection, even atthe extreme end of their variation curves, and short is completely recessive. In cases in which the environment enters moreobviously into the result (as in abnormal abdomen, ), the following scheme (Fig. 11) represents the relation:. Dry Wet Fia. 11.—Relation of normal to abnormal abdomen as shown by classes of Fi flies. Drysignifies conditions that make for normal; wet for abnormal. In this case both the heterozygous and the parentalabnormal type may show normal abdomen like the MENDELS FIRST LAW 33 wild type. The abnormal type is treated as the dominantalthough only when the conditions are favorable to itsappearance is the hereditary phenomenon seen. Inanother case (duplicate legs) only the homozygous formmay show the duplications (in a special environment).The following scheme (Fig. 12) represents this relation,reduplication of legs being treated as a recessive:
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectheredit, bookyear1919
