. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 430 ZOOLOGY dc4's law thus affords a sort of explanation of why a child often resembles a grandparent rather than a parent. For a recessive condition that appears in only one grandparent on each side cannot appear in the following generation, but only in the grandchildren. In addition to albinos breeders have obtained mice Tsathout the l)laek pigment in the hair; the result is a golden yellow. By reducing the j-ellow at the tips of the hair, the color be- comes chocolate. When the red and j'ellow are both a
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 430 ZOOLOGY dc4's law thus affords a sort of explanation of why a child often resembles a grandparent rather than a parent. For a recessive condition that appears in only one grandparent on each side cannot appear in the following generation, but only in the grandchildren. In addition to albinos breeders have obtained mice Tsathout the l)laek pigment in the hair; the result is a golden yellow. By reducing the j-ellow at the tips of the hair, the color be- comes chocolate. When the red and j'ellow are both absent from the tips, a black race is produced. In addition, some mice move in circles, producing the race known as waltzing mice. Mice are of interest not only on account of the evolution of the fanc3' races, but also on account of the rapidity with which they as well as their allies, the rats, have spread o^'er the world. The house mouse was originalh' lim- ited in its distribution to Asia. It made its way into Europe. By hiding in the cargoes of vessels, it has made its way o\'er the whole world. America originally had not a single representative of the genus INIus to which rats and mice belong. Both rats and mice were imported to America liy the earl}^ exi^lorers. Of the rats the roof rat seems to have been imported by the early Spanish discoverers to the Southern States, where it still persists. It originated in Egypt. The second was the black rat, believed to have. Fig. 39:?. — ;riir .Tohann 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
