. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. CHAPTER IV SEX INHERITANCE There are two types of sex inheritance known in those species in which separated sexes exist. In one type, which may be called the Drosophila type (XX- XY type, or, for short, the XY type), the female is homozygous for a sex factor, the male heterozygous; in the other, the Abraxas type (the WZ-ZZ type, or, for short, the WZ type) the female is heterozygous for a sex factor, the male homozygous. Since in both cases the heterozygous individuals must always mate with the homozygous ones there sh
. The Mechanism of Mendelian heredity. Mendel's law; Heredity; Chromosomes. CHAPTER IV SEX INHERITANCE There are two types of sex inheritance known in those species in which separated sexes exist. In one type, which may be called the Drosophila type (XX- XY type, or, for short, the XY type), the female is homozygous for a sex factor, the male heterozygous; in the other, the Abraxas type (the WZ-ZZ type, or, for short, the WZ type) the female is heterozygous for a sex factor, the male homozygous. Since in both cases the heterozygous individuals must always mate with the homozygous ones there should result in each succeeding generation equal numbers of heterozygous and homozygous individuals, and so the bisexual con- dition is perpetuated as follows:. The genetic evidence so far gained has placed in the Drosophila type the following animal forms: Dro- 78. 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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