. Adventures with animals and plants. Biology. 480 Orgamsim Are Froducts of Heredity and Enviroiwient unit ix. White—eye Wingless Fig. 429 The fruit fiy on. the right is normal. The others show four inheritable changes that have occurred. What are they? What do the words strap and miniature refer to? What other wing character have you read about? Of course, when the new gene is reces- sive there is no outward sign of the change until a later generation, when two such new genes may come together. Try to illustrate how this works out by doing Exercises i and 2, Changes in genes may produce harmf
. Adventures with animals and plants. Biology. 480 Orgamsim Are Froducts of Heredity and Enviroiwient unit ix. White—eye Wingless Fig. 429 The fruit fiy on. the right is normal. The others show four inheritable changes that have occurred. What are they? What do the words strap and miniature refer to? What other wing character have you read about? Of course, when the new gene is reces- sive there is no outward sign of the change until a later generation, when two such new genes may come together. Try to illustrate how this works out by doing Exercises i and 2, Changes in genes may produce harmful effects in the organism. A^Iost mutations do. Short (vestigial) wings are clearly harmful to the fruit fly; most of the other mutations shorten the life of the fly. By far the greater number of mutations are so harmful that the organism dies; others merely weaken the animal or plant; a few are an advantage to the organism. Alutations have been discovered in many organisms — corn, chickens, rabbits, „ ^ , . , , , , , mice, man, and many others. Any organ- l-iG. 430 Mutant (lert) in barley produced by . u u u ' r ' x-ray treatment. How does it differ from the ^^^ ^^^^ ^'^O^^'S ^^^ result of a mutation nor7nal plant at the right? (stadler) is called a TTfUtant,. 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 Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
