This aesthetic, in-depth, neatly typed document summarises 2.3 of strand 2 of the IEB grade 12 mind action series textbook: Reproductive animal strategies. it includes the full 2.3 reproductive animal strategies syllabus as well as additional class and research notes.
- Males have penis to insert sperm into female (copulation)
- More certain (Gametes are closer together and fewer gametes are needed)
- Energy saved in producing fewer gametes
3) Ovipary, Ovovivipary and vivipary:
• Reproductive strategies that describe that moment at which future o spring separates from
parent:
• Where embryos develop
• How embryo & foetus are nourished
• Ovipary: eg. catshark & snakes
. - Egg develops outside of body (fertilised internally or externally)
- Egg yolk is the only food embryos receive
- Most sh & amphibians (aquatic)
- birds and most reptiles (land)
• Ovovivipary: eg. ragged-tooth shark
. - Fertilised egg kept inside female until hatching (therefore o spring are born 'live')
- Embryo gets food from yolk in egg
- Some sh & reptiles
- Fewer eggs produced (mother's expenditure is less)
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