Reproduction - sshs.ecboe.org

Reproduction - sshs.ecboe.org

Organismal Development Part 3 Male Animals . Mitochondrion Intermembrane space Outer membrane Free

ribosomes in the mitochondrial matrix Inner membrane Cristae Matrix

Mitochondrial DNA 100 nm Phermones Earthworms are hermaphrodites Protogynous

(Male is blue) External Fertilization Internal Fertilization required Spermatogenesis Epididymis

Seminiferous tubule Testis Cross section of seminiferous tubule Spermatogonium Sertoli cell nucleus

Mitotic division, producing large numbers of spermatogonia Differentiation and onset of meiosis I Primary spermatocyte (in prophase of meiosis I) Meiosis I completed Secondary spermatocyte Meiosis II

Early spermatids Lumen of Seminiferous tubule Spermatids (at two stages of differentiation)

Differentiation Neck Sperm cells Head Midpiece Tail

Plasma membrane Acrosome Nucleus Mitochondria Secondary Sexual Characteristics

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