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Summary Reproductive Animal Strategies
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  • 12th Grade

Reproductive Animal Strategy notes include: - Courtship behaviours - External and internal fertilisation - Oviparous, viviparous and ovoviviparous - Amniotic egg - Precocial and altricial development - Parental care

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Document information

  • November 21, 2023
  • 4
  • 2022/2023
  • Summary

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  • notes

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  • 12th Grade
  • Unknown
  • 200

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katemidd25

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REPRODUCTIVE ANIMAL STRATEGIES

Reproduction → production of new generation of offspring from existing generation

Reproductive effort → produce maximum number if surviving offspring using least amount of energy

Courtship
- Behavior/ signals to attract a mate

1. Simple strategies:
● Chemical, visual or auditory stimuli
● Eg. frogs sing

2. Complex strategies:
● Unique to each species
● Large, elaborate features or energy
● Eg. Springboks have annual rut (sexual excitement)

Reproduction maximization:
● Ensures males & females find suitable mates
● Timed → ready for mating at same time
● Female conserves energy → energy from males

External vs. internal fertilisation

External:
- Takes place in water
- Not ideal → wasteful & uncertain

Reproduction maximization:
● Huge numbers of egg and sperm released → increases probability
● Courtship rituals → ensures gametes are close by

Internal:
- Male gametes released directly into female body
- Cloaca → opening in abdomen
- Penis releases sperm

Reproduction maximization:
● Gametes placed close together → more certainty
● Fewer gametes needed
● Energy focused on maximizing reproduction

Ovipary, ovovipary & vivipary
- Moment at which offspring separates from parent

Ovipary:
- Eggs develop outside of parent

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