Ch 46 & 47

Ch 46 & 47 - Chapter 46 Reproduction Understand...

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Chapter 46 – Reproduction Understand asexual, sexual reproduction and its variants (parthenogenesis and hermaphroditism) Understand process of sperm and egg development in humans, and how it is under hormonal control Know details of human menstrual cycle Types of Reproduction 0. Asexual reproduction of carbon copies by budding, fragmentation, etc. 1. Sexual reproduction involves combination of haploid gametes to form diploid zygote Variants on Sexual Reproduction 0. Parthenogenesis 0. Egg develops without fertilization 1. In bees, fertilized eggs (2N) are females , unfertilized eggs are males 2. Males rare in parthenogenetic organisms 1. Hermaphroditism (monoecy) 3. Both sets of reproductive organs 4. Most hermaphrodites outcross to avoid inbreeding depression 5. Sequential hermaphroditism involves sex change 0. Protandry : males become females because egg laying ability increases with size 1. Protogyny: females become males as in territorial reef fish like wrasses, where large males hold territories Figure 46.4 Sex reversal in a sequential hermaphrodite Reproductive Strategies 2. Either external fertilization, high fecundity, small young (numbers strategy), if resources abundant or 3. Internal fertilization, increased parental care (fewer but larger young) if resources limiting Figure 46.6 Parental care in an invertebrate Spermatogenesis and Oogenesis 4. Will have to learn mammalian reproductive anatomy (pp. 968-973) on your own 5. Spermatogenesis is meiotic divisions producing differentiated,
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haploid sperm in testis 6. Oogenesis is meiotic divisions producing haploid egg in ovary
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This note was uploaded on 12/02/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Ch 46 & 47 - Chapter 46 Reproduction Understand...

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