1202L16 - Chapter 46 Reproduction Understand asexual,...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 Sex is adaptive in unpredictable environments or to combat pathogens Variants on Sexual Reproduction 0. Parthenogenesis 0. Egg develops without fertilization 1. In bees, fertilized eggs (2N) are females , unfetilized eggs are males 2. Males rare in parthenogenetic organisms 1. Hermaphroditism (monoecy) 3. Both sets of reproductive organs 4. Most outcross to avoid inbreeding depression 5. Sequential hermaphroditism involves sex change 0. Protandry : (males switch to females as they grow to produce costly egges) males become _________ because egg laying ability increases with size (as in oysters) 1. Protogyny: females become males as in territorial reef fish like wrasses, where large males hold territories Sex reversal in a sequential hermaphrodite
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Reproductive Strategies 3. Either external fertilization, high fecundity, small young (numbers strategy), if resources abundant or 4. Internal fertilization, increased parental care (fewer but larger young) if resources limiting Figure 46.6 Parental care in an invertebrate Spermatogenesis and Oogenesis 5. Will have to learn mammalian reproductive anatomy (pp. 1003 – 1007) on your own 6. Spermatogenesis is meiotic divisions producing differentiated,haploid sperm in testis
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

1202L16 - Chapter 46 Reproduction Understand asexual,...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online