. Biology. Biology. FIG. 92.—The chromosomes of the squash bug, Anasa tristis, twenty-one in the male, twenty-two in the female. At maturation these chromosomes pair two by two, similar ones mating together (/), one odd one (h) remaining unpaired in the male, but paired in the female (/) and (h). After the maturation divisions of each primordial germ cell, two of the resulting spermatozoa will have eleven chromosomes and two will have ten, while all of the egg cells will have eleven. If one of the first two fertilizes the egg the result will be a female with twenty- two chromosomes; if one of
. Biology. Biology. FIG. 92.—The chromosomes of the squash bug, Anasa tristis, twenty-one in the male, twenty-two in the female. At maturation these chromosomes pair two by two, similar ones mating together (/), one odd one (h) remaining unpaired in the male, but paired in the female (/) and (h). After the maturation divisions of each primordial germ cell, two of the resulting spermatozoa will have eleven chromosomes and two will have ten, while all of the egg cells will have eleven. If one of the first two fertilizes the egg the result will be a female with twenty- two chromosomes; if one of the latter two unites with the egg the resulting individual will be a male with twenty-one chromosomes. (From Wilson.). 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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