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The Body and the Germplasm 1519
The Appearance of the Accessory Organ
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abdomen appear birds Boveri breeding castrated cells chro classes of sperm color Columbia University combinations condition conjugation cross Darwin egg nucleus eggs eggs produce embryo evidence evolution evolution of sex fact factor for horns female Fig female-producing sperm fertilized eggs flies forms four gametes germ-cells give gray gray-red gynandromorph half heredity hermaphroditic hornless hybrid hydatina inbred individuals insects kinds long-winged males and females mammals mating Maupas Mendel's Mendelian micronuclei mosomes normal male number of chromosomes offspring ovary paramcecium parent parthenogenetic parthenogenetic female polar bodies pollen race red-eyed male reproduction Rhabditis secondary sexual characters self-fertilization sex chromo sex chromosomes sex factor sex glands sex ratio sex-determination sex-linked sex-linked inheritance sexual egg sexual females sexual reproduction sexual selection shown species sperm spermatocyte spermatogenesis spermatozoa stage strains studied synapsis takes place theory tion vigor white eyes white-eyed male wings yellow