Reproduction and Development

Reproduction and Development - Reproduction and...

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Unformatted text preview: Reproduction and Reproduction and Development Reproduction Reproduction Binary fission (Asexual) Fission Budding Fragmentation Reproduction Reproduction Male Sperm (Sexual) Female Ovum (plural=ova) Male and Female??? Hermaphrodites Fertilization Fertilization External Oogenesis Oogenesis Spermatogenesis One gamete Large, non­motile, well­ nourished 1º oocytes created during fetal devel, a few mature each month Meiosis completed at fertilization Four gametes Small, motile, few nutrients 1° spermatocytes created daily, sperm mature every day Meiosis completed independently Female Reproductive Cycle Female Reproductive Cycle Ovarian cycle Menstrual cycle Sexually Transmitted Diseases Sexually Transmitted Diseases (STD’s) Bacterial Viral Chlamydial infections Gonorrhea Syphilis Genital herpes Genital warts HIV/AIDS Protozoan Fungal Infertility Infertility 15% of couples who want children Reproductive endocrinologists Male factors Female factors Infertility Treatments Infertility Treatments Natural treatments for low sperm count Hormone treatment Artificial insemination (AI) Surrogacy In­vitro fertilization (IVF), Gastrulation Gastrulation Ectoderm nervous system and outer layer of skin Endoderm innermost lining of digestive system and other organs Mesoderm most other organs and tissues Developmental Signals Developmental Signals Regulatory chemicals Induction Change in cell shape Developmental Signals Developmental Signals Regulatory chemicals Induction Change in cell shape Cell migration Apoptosis (programmed cell death) Gestation Gestation Humans = 38 weeks but measured as 40 weeks (9 months) Mice = 1 month Elephants = 22 months ...
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