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Summary Life Sciences: Diversity in Reproductive Strategies

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This is an in-depth summary of topic 3 of the Solutions for all Life Sciences grade 12 Learners book which is: Diversity in Reproductive Strategies.

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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
Connected book
image
J. De Fontaine Solutions for All Life Sciences
Publisher: 2012 ISBN: 9781431010486 Edition: Unknown

Document information

Schooljaar
200
Summarized whole book?
No
Which chapters are summarized?
Topic 3
Uploaded on
November 28, 2022
Number of pages
3
Written in
2022/2023
Type
Summary
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  • ieb
  • life sciences
  • summary
  • diversity in reproductive strategies

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