Summary Life Sciences: Diversity in Reproductive Strategies

DIVERSITY IN REPRODUCTIVE STRATEGIES
EXTERNAL + INTERNAL FERTILISATION *courtship: behaviour that results in mating
- Vertebrae animals reproduce sexually
- Successful reproduction requires: fertilisation (ova + sperm need to meet) + liquid
medium (sperm swim)

External fertilisation: Internal fertilisation:

Type of - Fish + amphibians - Terrestrial
animal:

Happens: - Outside body - Inside body of female

Physical - None - Close
contact:

Rate of - Low = many eggs + sperm produced + - High = fewer eggs produced
success: released

Courtship: - Colour changes in fish - Sniffing
- Mass external fertilisation at full moon at - More elaborate displays
particular time of year
- Fogs croaking
Liquid - Water - Semen
medium:

Example: - Male + female fish circle each other while - During copulation: semen is placed inside
releasing their sperm + eggs (spawning) = body of female by penis
sperm cells swim/carried by current toward
the egg
- Frog calls to attract a female into his
territory (courtship) = female arrives = male
climbs onto back of female = she releases
eggs while he releases sperm over the
eggs