. Botany for agricultural students. Plants. 550 HEREDITY and feathers in chickens, etc. In man many characters, among which are insanitj^ and susceptibihty to tuberculosis, are known to behave according to Mendel's law, and Eugenics, which has to do with applying the lavv's of heredity in a way to produce a healthier and a more efficient race of men, has its chief sup- port in Mendelism. Mendel's discoveries have already enabled us to make some notable achievements in the way of improving plants and ani- mals. By working according to the Mendehan conception, many desirable varieties of the cer
. Botany for agricultural students. Plants. 550 HEREDITY and feathers in chickens, etc. In man many characters, among which are insanitj^ and susceptibihty to tuberculosis, are known to behave according to Mendel's law, and Eugenics, which has to do with applying the lavv's of heredity in a way to produce a healthier and a more efficient race of men, has its chief sup- port in Mendelism. Mendel's discoveries have already enabled us to make some notable achievements in the way of improving plants and ani- mals. By working according to the Mendehan conception, many desirable varieties of the cereals, much more desirable. Fig. 479. — Height of plants in the Fo generation of 'Tom Thumb Pop Corn (a dwarf Corn) crossed with Missouri Dent (a large Corn). The plant at the extreme right is similar in height to the dwarf parent, while the one at the extreme left is similar in height to the Missouri Dent. After Emerson and East. ornamental plants, and various kinds of better fruits have been developed. Of course in the extended investigations in Genetics since 1900, many situations have arisen that Mendel did not meet Cases have arisen in which the Mendelian behavior can be explained better by assuming that pairs of contrasting characters are due to the presence and absence of certain factors and not to dominant and recessive factors. According to the latter hypothe- sis, the tallness of the tall variety of Peas is due to the presence of a factor for tallness, while dwarfness in the dwarf variety is. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
