Summary
Summary reproduction in vertebrates
- Course
- Life Sciences
- Institution
- 12
reproduction in vertebrates
[Show more]
Seller
Follow
Content preview
reproduction in vertebrateE X T E R N A L V S I N T E R N A L F E R T I L I S AT I O N
EXTERNAL INTERNAL
- takes place outside females body - takes place inside female body
- fish and amphibians living in aquatic - insects and terrestrial verterates
habitats
- needs water for fertilisation - can occur in any environment
- large number gametes released - fewer games produced therefore less
therefore more energy used to produce energy used to produce gametes
many gametes
- parents dont expend energy on taking - energy spent on ensuring fertilisation
care of young
- little cooperative behaviou - cooperative behaviour required
- ova release chemical attract sperm = between males and females
chemotaxi
- fertilised egg developed larvae and
lives on jelly/yolk
O V I PA RY, O V O V I V I PA RY A N D V I V I PA RY
describes where embryo developed and how embryo receives nutritio
OVIPARY OVOVIVIPARY VIVIPARY (only mammals)
- embryo developed in egg - fertilised egg remains - fertilised egg doesn't
outside females body inside females body until develop shel
fully developed - embryo developed inside
- as soon ready to hatch it is female uterus and born
laid in soft membrane live
oviparous aquatic animals - no physical connection - physical connection
- external fertilisatio between mother and between embryo and
- lots egg cells produce embry mothe
- embryo surrounded jell - embryo receives nutrition - embryo receives nutrition
- eggs with little yolk from lots of yolk via placenta
produced
oviparous terrestrial - few egg cells since - born are born more strong
animals development inside body = as a result of development
- internal fertilisatio high success rati strategy
- few egg cell - no predator
- embryo surrounded by - favourable conditions
shel
- lots yolk = lots energy
l
o
r
:
s
l
s
s
o
n
n
d
y
:
r
s
n
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller emmahayes. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R140,00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
56326 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now