. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. XY xr yx XX MALES FEMALES MATING. ^2 Fig. 207.—Chart showing the behavior of genes that are associated with the sex chromosomes. The example given is that of White eye, a sex-Unked character in the fruit fly. It is recessive to the normal eye color, Red. See also Fig. 201, Fig. 202, and Fig. 203. mated with a normal Red-eye female, homozygous for Red. The Fi generation then, as usual, are male and female in equal num- bers. The females derive one of their X chromosomes from the father, which
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. XY xr yx XX MALES FEMALES MATING. ^2 Fig. 207.—Chart showing the behavior of genes that are associated with the sex chromosomes. The example given is that of White eye, a sex-Unked character in the fruit fly. It is recessive to the normal eye color, Red. See also Fig. 201, Fig. 202, and Fig. 203. mated with a normal Red-eye female, homozygous for Red. The Fi generation then, as usual, are male and female in equal num- bers. The females derive one of their X chromosomes from the father, which contains the gene for White eye, and one from the mother, which contains the normal allelomorph. Red. The females are therefore heterozygous for eye color; since Red is dominant, the phenotype is Red eye. The males of the Fi generation derive their X chromosome from the mother and are therefore Red 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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