. Advanced biology. Biology; Physiology; Reproduction. International Xeivs Scrria Variations in the heads of birds. All the birds in I the picture may be descendants of the same original ancestor. Compare these with others that you know. are all enough alike to be classed as insects, pigeons, or dahlia plants; but each is different in some way from all the others. The problems of these likenesses and differences are the problems of heredity. The study of heredity includes a study of all the various characteristics in the offspring that are more or less similar to those characters of the ancest
. Advanced biology. Biology; Physiology; Reproduction. International Xeivs Scrria Variations in the heads of birds. All the birds in I the picture may be descendants of the same original ancestor. Compare these with others that you know. are all enough alike to be classed as insects, pigeons, or dahlia plants; but each is different in some way from all the others. The problems of these likenesses and differences are the problems of heredity. The study of heredity includes a study of all the various characteristics in the offspring that are more or less similar to those characters of the ancestors. Environment influencing development. Individuals of the same species may differ because all do not have exactly the same conditions during their early development. Differences in tem- perature, in the relative amount of moisture, in the character of weather, or of food may cause plants to be stunted or slow to flower in one region Avhen compared with the similar plants of another region. A more abundant supply of mineral salts, or more sunshine at certain periods, may produce plants that are some- what better developed than others grown from the seeds of the same parent plant. Every farm, every roadside, and every city lot furnish examples of plants that have thrived better or worse than their neighbors, because of variations in their environments. Temperature, moisture, light, and food are some of the factors that influence the development of animals as well as of plants. The male of the European bullfinch has a bright red breast; the female is entirely brown. If the male bird is fed on hempseed, its ])lumage changes to a dull color similar to the female. Among honey-. 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 Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Bo
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Keywords: ., bookcentury1900, bookdecade1920, booksubje, booksubjectphysiology
