. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. 10 MENDELIAN SEGREGATION If the factors for vestigial wings are carried by a pair of chromosomes (the chromosomes carrying v in Fig. 3) then at the ripening of the germ cells (eggs and sperm) such a pair of chromosomes will come together and at reduction separate; so that each germ cell will have one such chromosome and not the other. (See Fig. 1, e-h.) If such a germ cell fertilizes an egg of the wild fly that contains a similar group of chromosomes, ex-. o o II Pig. 4.—{A.) Fertilization of egg by sperm. (B.) Zygote
. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. 10 MENDELIAN SEGREGATION If the factors for vestigial wings are carried by a pair of chromosomes (the chromosomes carrying v in Fig. 3) then at the ripening of the germ cells (eggs and sperm) such a pair of chromosomes will come together and at reduction separate; so that each germ cell will have one such chromosome and not the other. (See Fig. 1, e-h.) If such a germ cell fertilizes an egg of the wild fly that contains a similar group of chromosomes, ex-. o o II Pig. 4.—{A.) Fertilization of egg by sperm. (B.) Zygote formed by union of egg and sperm. (C) Diploid nucleus. cept that the corresponding chromosome carries the factor for long wings (Fig. 4, A), the result will be to produce a fertihzed egg (Fig. 4, C) in which one mem- ber of the pair of chromosomes in question comes from the mother and carries the factor for long, and the other comes from the father- and carries the factor for vestigial wing. Since this egg with both factors present produces a fly with long wings, the vestigial character is said to be recessive to the long; or conversely the long is said to be dominant to the vestigial character. When the eggs and the sperm of hybrid flies of this origin come to maturity,' the homologous chromo- /. 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 Morgan, Thomas Hunt, 1866-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
