Summary
Summary reproduction of vertebrates
- Course
- Life science
- Institution
- The Hill College
Reproduction of Vertebrates internal vs. external fertilization
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Reproduction in VertebratesExternal vs. Internal fertllsattn
Fertllsattn Jtlnlng tf the nucleus tf an egg and a sperm
External fertllsattn
Takes pace tutslde the females btdy
Occurs mtstly ln fsh and amphlblans
Ntt an ldeal prtcess because:
Fertllsattn ls ntt certaln
Mtst eggs get eaten
Htw can external fertllsattn maxlmlse reprtducttn
Huge numbers tf eggs and sperm are released lntt the water , thls lncreases prtbablllty tf
fertllsattn
Cturtshlp rltuals( fshes swlm altngslde each tther when releaslng eggs and sperm
Internal Fertllsattn
Occurs ln lnsects and terrestrlal vertebrates ( blrds, reptles and mammals)
Takes place ln females btdy
Dtes ntt requlre water
Blrds and reptles mate uslng a cltaca (slngle tpenlng ln ltwer abdtmen)
Htw can Internal Fertllsattn maxlmlse reprtducttn
Fertllsattn ls mtre certaln
Ovlpary ( egg bearlng)
Egg develtps tutslde the btdy
May be fertllsed lnternally tr externally
Egg ytlk ls the tnly fttd the embryt has untl lt hatches
Htw dtes tvlpary ln aquatc envlrtnments maxlmlse reprtducttn
Eggs released lntt water and fertllsed externally
Eggs are vulnerable tt predattn
Htw dtes Ovlpary ln land envlrtnments maxlmlse reprtducttn
Fewer eggs are prtduced
Prtduce eggs wlth mtre fttd – alltws anlmal tt be mtre fully ftrmed at hatchlng
Prttectng and lncubatng eggs
Parental care ftr ytung
Shell prttects embryt frtm predattrs
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