Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 HEREDITY 313 SPERM A TO GENESIS DIVISION PERIOD GROWTH PERIOD SYNAPSIS IsT MATURATION DIVISION CHROMOSOMES REDUCED TO HAPLOID NUMBER. ^NO MATURATION DIVISION PRIMORDIAL GERM CELL {DIPLOID CHROMOSOME NUMBER) SPERMATOGONIA SPERMATOCYTE 1 SPERMATOCYTE H SPERMATIDS SPERM A TOZOA FiG, 201.—Diagram of the maturation of spermatozoa. Note the-two types of sperms, one with and one without an X chromosome. One of each type is introduced in Fig. 203. Fo

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Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 HEREDITY 313 SPERM A TO GENESIS DIVISION PERIOD GROWTH PERIOD SYNAPSIS IsT MATURATION DIVISION CHROMOSOMES REDUCED TO HAPLOID NUMBER. ^NO MATURATION DIVISION PRIMORDIAL GERM CELL {DIPLOID CHROMOSOME NUMBER) SPERMATOGONIA SPERMATOCYTE 1 SPERMATOCYTE H SPERMATIDS SPERM A TOZOA FiG, 201.—Diagram of the maturation of spermatozoa. Note the-two types of sperms, one with and one without an X chromosome. One of each type is introduced in Fig. 203. For convenience the Y chromosome is omitted.

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