. Elementary biology; an introduction to the science of life. Biology. rmg agam. Fig. 241. The law of unit characters illustrated by guinea pigs Pigmentation in these animals is dominant over albi- nism. Short hair is dominant over long hair. Rough coat is dominant over smooth coat. When two pure individuals like those shown are mated, the offspring will be short-haired, dark, and rough-coated. On mating the hybrids together in sufficient numbers, the segrega- tion will result in producing every combination of these three sets of characters : dark-short-rough; dark-short- smooth ; dark-long-ro
. Elementary biology; an introduction to the science of life. Biology. rmg agam. Fig. 241. The law of unit characters illustrated by guinea pigs Pigmentation in these animals is dominant over albi- nism. Short hair is dominant over long hair. Rough coat is dominant over smooth coat. When two pure individuals like those shown are mated, the offspring will be short-haired, dark, and rough-coated. On mating the hybrids together in sufficient numbers, the segrega- tion will result in producing every combination of these three sets of characters : dark-short-rough; dark-short- smooth ; dark-long-rough ; dark-long-smooth ; white- short-rough ; white-short-smooth ; white-long-rough ; white-long-smooth. The proportions will be such that for each pair of contrasted characters there will be one recessive to every three dominants. (From photographs lent by Professor W. E. Castle) These three laws of heredity — domi- nance, segregation, and nnit character— are known as the Mendelian laws, or principles, because they were first dis- covered by Gregor Mendel. They have been found sufficiently reliable to serve as a basis for practical work of great impor- tance in connection with the breeding of plants and 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston New York [etc. ] Ginn and company
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