. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. 2YO:2XK iXi X 1 ? XX XI 9 ? c? Fi Gametes F2 Fig. 88.—Reciprocal cross to that shown in Figure 87. Parents, red-eyed male and white-eyed female; Fi, white-eyed males and red-eyed females ("criss- cross inheritance"—Morgan); Fa equal numbers of red-eyed and white-eyed individuals of both sexes. The distribution of the sex chromosomes is shown at the right, as in Figure 87. {From Conklin, after Morgan.) eggs having such a constitution were to be fertilized with a sperm which lacked X (male determining sperm
. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. 2YO:2XK iXi X 1 ? XX XI 9 ? c? Fi Gametes F2 Fig. 88.—Reciprocal cross to that shown in Figure 87. Parents, red-eyed male and white-eyed female; Fi, white-eyed males and red-eyed females ("criss- cross inheritance"—Morgan); Fa equal numbers of red-eyed and white-eyed individuals of both sexes. The distribution of the sex chromosomes is shown at the right, as in Figure 87. {From Conklin, after Morgan.) eggs having such a constitution were to be fertilized with a sperm which lacked X (male determining sperm), this would make possible the production of F^ males possessing both dominant characters and others possessing both recessive characters or gray-red and yeUow- white respectively, as actually observed in about one case in a hundted by Morgan. It may add interest to the case to state parenthetically that in man occur a number of sex-linked variations which are inherited in this same curious fashion. Among them may be mentioned color blindness and. 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 Newman, Horatio Hackett, b. 1875. Chicago : University of Chicago Press
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