. Biology in America. Biology. Mendelism 267 A few examples of what breeders have accomplished may be of interest. Professor Castle has shown that there is in guinea pigs a factor which restricts black and brown pigment to the eyes, while yellow pigment is unaffected by it. When a brown pig is crossed with a black-eyed yellow one con- taining this factor, some of the offspring receive it in com- bination with the factor for brown and are consequently brown-eyed yellow—a new "creation" unknown before Cas- tle's experiments were made. "While brown-eyed yellow. A Herd of Hornless C
. Biology in America. Biology. Mendelism 267 A few examples of what breeders have accomplished may be of interest. Professor Castle has shown that there is in guinea pigs a factor which restricts black and brown pigment to the eyes, while yellow pigment is unaffected by it. When a brown pig is crossed with a black-eyed yellow one con- taining this factor, some of the offspring receive it in com- bination with the factor for brown and are consequently brown-eyed yellow—a new "creation" unknown before Cas- tle's experiments were made. "While brown-eyed yellow. A Herd of Hornless Cattle Hornlessness may be bred in cattle by proper attention to Mendelian laws. Courtesy of the U. 8. Bureau of Animal Industry. guinea pigs may not mean any more to the fancier in dol- lars and cents than do black-eyed yellow ones, nevertheless the experiment demonstrates the possibility of scientific breeding in the production of varieties which do have eco- nomic value. The presence of horns on a vicious bull, or a refractory cow, has always constituted a serious menace to tlie owner's peace of mind, and often such animals have to be dehorned. But the breeder has a better means for dehorning his stock, for lack of horns in cattle is dominant to the horned condi- tion, and by crossing horned cattle with hornless ones of other. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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