The spermatogenesis and maturation and fertilization of the germ-cells present nothing out of the common and need not be C. [Please select]
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The following description of spermatogenesis is based chiefly on material collected in 1955, although testes were preserved also in 1954. [Please select]
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Comparison of material obtained in 1954 and 1955 revealed that spermatogenesis began earlier and was more advanced on any given date in 1955 than in 1954. [Please select]
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Spermatogenesis is well under way by mid-June; at this time, two or three distinct layers of primary and secondary spermatocytes are present and these cells outnumber the Sertoli cells. [Please select]
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