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Relative success of External & Internal Fertilisation - Coggle Diagram
Relative success of External & Internal Fertilisation
Internal
Gametes
Fewer ova produced
large number of sperm produced
Union
Inside the female's body
Reproductive tract
Occurs in organisms that live on land
Conception Mechanism
Copulation
Chance of Fertilisation
High
Gametes are released in a confined space
Environment for Zygote
Internal
Temp. is controlled
Less chance of predation
Less chance of infection
Parental Development
Parental care is common
Mammals
Monotremes
Oviparous
Platypus
parents incubate their eggs in nest
Echina
Eggs
In abdominal pouch
Stay for 7 weeks
internal fertilisation
lay eggs
outside the mother's body
Marsupials
Fertilisation
Embryonic Development in a pouch
Red Kangaroo
Reproductive adaptation
in drought climate
in prolonged drought
kangaroos stop breeding
only again when rain triggers
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Newborn requires far less milk
For first few weeks in pouch
ensures the continuity of young
Conditions are good
Allows rapid population growth
Effective Mechanism
Restricts Reproduction
Times when conditions favour
Survival of young
External
Gametes
large numbers of gametes produced
Union
Takes place in open water environment
Conception Mechanism
Simultaneous release of gametes
Chance of Fertilisation
Low
Gametes are released in large open areas
Less chance of union
Environment for Zygote
External
Watery environment
Vulnerable to environmental elements
Temperature
Predation
Infection
Rapid Dispersal from the area
Parental Development
Usually no parental care
Staghorn Coral
Fertilisation
Shedding millions of gametes into sea
Mass Spawnings on Great Barrier Reef
Sea turns milky
Fertilised eggs
Swimming larvae
form a new colony
Few survive
Almost all are eaten by predators
Environmental cues
Shape their reproductive cycle
Such as:
Water Temperature
Tides & Day length