1. Lesson 1: Reproduction & Development Tuesday, March 13
AIM: How do animals reproduce?
What is the anatomy of the human male reproductive system?
DO NOW: Distinguish between calcitonin & PTH.
HW: Study all notes and hormones
Read Ch. 13 in review book
MC packet on Ch. 46 # 1-18
Hormone QUIZ Wednesday

2. Asexual Reproduction Advantages: No mate needed
Lots of offspring produced quickly
If environment remains favorable, clones are a good thing.
Disadvantages:
No variation – offspring identical to parents

3. 5 Types of Asexual Reproduction
Binary fission (prokaryotes)
Budding (Hydra & yeast)
Fragmentation and regeneration
Lower left – 2 mitochondria budding 3

4. Parthenogenesis (honeybees, some lizards, some amphibians)
Specialized cells  new
organism (gemmules in
sponges)
In parthenogenesis, there is a doubling of chromosomes after meiosis. 4

5. Sexual Reproduction Hermaphroditism Gonads non-mammalian vertebrates:
Cloaca –common opening to the digestive, excretory, and reproductive systems
Internal vs. external fertilization
Internal vs external development

6. Human Male Reproductive System

9. Human Male Reproductive System
Testes
in scrotum (20 lower than body temperature)
seminiferous tubules – FSH from ant pit stimulates sperm production
interstitial cells (Leydig cells) – LH from ant pit stimulates testosterone production
Sertoli cells -- nourish spermatids
Epididymus -- maturation and storage of sperm

10. Spermatogenesis in seminiferous tubules
Spermatogonium (2n)
Primary spermatocyte (2n)
Secondary spermatocyte (n)
Spermatid (n)
Sperm (n)

11. Vas deferens – transfer sperm from epididymus to urethra

13. Vasectomy
Severing of vas deferens
Method of birth control

14. Caveat
Do not confuse seminiferous tubules with seminal vesicles.

15. Sperm Sperm head – haploid nucleus – 23 chromosomes
Acrosome –tip–-- has lysosymes to penetrate egg
Midpiece – first part of the flagellum – many mitochondria –
Tail – last part of flagellum