1. MAIN POINT: In males, spermatogonia generate FOUR haploid spermatids
MAIN POINT: In males, spermatogonia generate FOUR haploid spermatids. In females, oogonia become ONE haploid oocyte and three miscellaneous polar bodies.
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2. Reiterates spermatogenesis on previous slide.
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3. MAIN POINT: There are two functional components of sperm
MAIN POINT: There are two functional components of sperm. The head contains acrosomal enzymes that degrade the zona pellucida enveloping the egg and a tail for motility through the lubricious environment.
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4. MAIN POINT: Sperm are made in the seminiferous tubules and stored in the epididymis until ejaculation in which they travel through the vas deferens.

5. MAIN POINT: During puberty, primary follicles (small, translucent) develop into mature follicles (large and multicellular) before being expelled from the ovary
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6. Summary of gametogenesis, fertilization, and cleavage
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7. The winner of the race: Sperm penetrating the egg and subsequent fertilization
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8. Sperm Competition Larger ejaculate Prolonged Copulation
Copulatory Plug
Tactics used by males of polygynous (many females) and polyandrous (many males) species to ensure they are the father.

9. Cleavage, rapid division of the newly formed zygote resulting in a blastula.
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10. Seminiferous tubule
SLIDE WORK: Spermatids are the smallest, most condensed (vibrant purple under microscope). Seminiferous tubules are the vascularized balls encompassing the Sertoli cells, spermatogonia, etc. Leydig cells lie in the interstitial space in between the seminiferous tubules.

11. SLIDE WORK: Primary follicles are the small, translucent circles, while the mature follicles (not shown here) are large and multicellular.