CH 49 - Reproduction Chapter 49 Learning Objective 1...

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Unformatted text preview: Reproduction Chapter 49 Learning Objective 1 Compare the benefits of asexual and sexual reproduction Describe each mode of reproduction, giving specific examples Asexual Reproduction Single parent genes of offspring identical to parents (except for mutations) Benefits energy efficient most successful in a stable environment Types of Asexual Reproduction Budding part of parents body grows, detaches Fragmentation parents body breaks into pieces each piece can develop into new animal Parthenogenesis unfertilized egg develops into adult Budding Sexual Reproduction Fusion of two types of gametes ( egg and sperm ) produces offspring a fertilized egg ( zygote ) Benefits genetic variety adaptive in unstable, changing environment Fertilization External fertilization mating partners release eggs and sperm into water simultaneously Internal fertilization male delivers sperm into females body External and Internal Fertilization KEY CONCEPTS Most animals reproduce sexually by fusion of sperm and egg, but some animals reproduce asexually and some can reproduce either way, depending on conditions Learning Objective 2 Describe the structure and function of each organ of the human male reproductive system Male Reproductive System Testes (produce sperm and testosterone) Series of conducting ducts Accessory glands Penis Testes 1 I n the scrotum Contain seminiferous tubules where spermatogenesis (sperm production) takes place Testes 2 Interstitial cells secrete testosterone Sertoli cells produce signaling molecules and fluid that nourishes sperm cells Conducting Ducts Epididymis and vas deferens sperm maturation and storage Ejaculation of sperm from vas deferens to ejaculatory duct into urethra (through penis) Accessory Glands Semen about 200 million sperm per ejaculation secretions of seminal vesicles and prostate gland Bulbourethral glands release mucous secretion The Penis Three columns of erectile tissue 2 cavernous bodies 1 spongy body (surrounds urethra) Erectile tissue engorges with blood penis becomes erect Male Reproductive System Fig. 49-3a, p. 1054 Bladder Seminal vesicle Pubic bone Ejaculatory duct Prostate Vas deferens Rectum Cavernous body Bulbourethral gland Spongy body Epididymis Urethra Scrotum Glans penis Testis Fig. 49-3b, p. 1054 Spermatic cord Testicular veins Testicular artery Vas deferens Head of epididymis Seminiferous tubules Capsule of testis Tail of epididymis Pampiniform Plexus Blood Supply to the Testes The Fibro-elastic Penis Comparative Penis Anatomy Fibro-elastic penes Boars Bulls Rams Vascular-muscular penes Stallions Men The Human Penis Fig. 49-7a, p. 1057 Urinary bladder Openings of ejaculatory ducts Prostate gland Bulbourethral gland Openings of bulbourethral glands Cavernous bodies Spongy body...
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This note was uploaded on 02/27/2009 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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CH 49 - Reproduction Chapter 49 Learning Objective 1...

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