. Biology. Biology. Profe/w 9 • •. D FIG. 98.—Diagram illustrating the history of the sex chromosome X in the bug Protenor. In the male (cf) there is one large, unpaired chromosome X (repre- sented as blank) in A-E'. B, Union of the chromosomes in pairs except the X- chromosome. The two successive maturation divisions (C, D\ show the dis- tribution of X in the resulting spermatozoa (E, E7), two of the four having X, two having no X. The latter have only five chromosomes, and on uniting with eggs, produce only male individuals. The female organisms have two X's which pair in maturation like the
. Biology. Biology. Profe/w 9 • •. D FIG. 98.—Diagram illustrating the history of the sex chromosome X in the bug Protenor. In the male (cf) there is one large, unpaired chromosome X (repre- sented as blank) in A-E'. B, Union of the chromosomes in pairs except the X- chromosome. The two successive maturation divisions (C, D\ show the dis- tribution of X in the resulting spermatozoa (E, E7), two of the four having X, two having no X. The latter have only five chromosomes, and on uniting with eggs, produce only male individuals. The female organisms have two X's which pair in maturation like the other chromosomes, so that the resulting eggs and polar bodies all have one X. A spermatozoon with X, uniting with an egg, produces a female organism. (From Morgan.). 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
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