Reproductive Strategies in Vertebrates (Grade 12 NSC Matric Life Sciences): Flashcards
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Reproductive strategy
Reproductive strategy
Adaptations improving fertilisation & offspring survival
External fertilisation
External fertilisation
Sperm & egg meet outside female's body, needs water
Internal fertilisation
Internal fertilisation
Sperm deposited inside female's body to meet egg
Ovipary
Ovipary
Animals lay eggs; embryo develops outside mother's body
Ovovivipary
Ovovivipary
Eggs stay inside mother until hatching, nutrients from yolk
Vivipary
Vivipary
Embryos develop in uterus, nourished via placenta
Amnion function
Amnion function
Fluid-filled sac that cushions & protects embryo
Allantois function
Allantois function
Collects waste & facilitates gas exchange
Precocial development
Precocial development
Well-developed, independent young; eyes open at birth/hatching
Altricial development
Altricial development
Underdeveloped young needing extensive parental care