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external fertilisation in a sentence

1. Despite this, the eggs are laid singly, a behaviour not conducive for external fertilisation.

2. Certain primitive salamanders in the families Sirenidae, Hynobiidae and Cryptobranchidae practice external fertilisation in a similar manner to frogs, with the female laying the eggs in water and the male releasing sperm onto the egg mass.

3. With a few exceptions, frogs use external fertilisation.

4. There are three steps to fertilisation that ensure species-specificity: Consideration as to whether an animal (more specifically a vertebrate) uses internal or external fertilisation is often dependent on the method of birth.

5. Oviparous animals producing eggs with thin tertiary membranes or no membranes at all, on the other hand, use external fertilisation methods.

6. Advantages to external fertilisation include: minimal contact and transmission of bodily fluids;

7. decreasing the risk of disease transmission, and greater genetic variation (especially during broadcast spawning external fertilisation methods).

8. Like other non-insect hexapods, diplurans practice external fertilisation.

9. Most use external fertilisation: the female lays a batch of eggs, the male fertilises them and the larvae develop without any further parental involvement.

10. The five include two nonviviparous modes: ovuliparity, with external fertilisation, and oviparity, with internal fertilisation.

11. Reproduction involves external fertilisation after "a brief courtship".

12. Whereas in general, polychaetes are marine and have separate sexes, external sperm transfer and external fertilisation, oligochaetes live on land or in fresh water, are hermaphrodites, have no external sperm transfer and fertilisation takes place in the clitellum or cocoon.

13. Thus, the tailed frogs exhibit internal fertilisation, rather than the external fertilisation found in other frogs.

14. Scaphopods have separate sexes, and external fertilisation.

15. In marine species with limited mobility and external fertilisation like corals, sea urchins and clams, the timing of the common spawning is the only externally visible form of sexual behaviour.

16. Only two clownfish, a male and a female, in a group reproduce through external fertilisation.

17. The sturgeon may breed three or four times during its life, and a female sturgeon can carry in excess of a million eggs in one cycle, which are released for external fertilisation when mature.

18. Surge channels have been likened to 'containment vessels', retaining water borne gametes and probably enhancing the effectiveness of external fertilisation of marine species dwelling within them.

19. According to Williamson, these successful hybridisations would most likely occur in organisms with external fertilisation or male gamete dispersal.

20. The reliability of paternity will be influenced by the mode of fertilisation, where external fertilisation occurs at the time of oviposition or egg laying, and internal fertilisation occurs during sexual reproduction within the body of a parent.

21. This hypothesis suggests that the roles may be reversed with external fertilisation.

22. With external fertilisation, eggs are often laid by the female in a male's territory.

23. Male territoriality is particularly common with external fertilisation.

24. It breeds in summer, via external fertilisation.

25. Broadcast spawners: release their gametes (sperm and eggs) into open water for external fertilisation.

26. They release eggs and sperm simultaneously into the water and external fertilisation takes place.

27. It is free-spawning with external fertilisation in the water.

28. It also reproduces sexually, with both sperm and eggs being released into the water table in synchronized spawnings for external fertilisation.

29. These nocturnal fish, which exhibit external fertilisation of eggs, and mouthbrooding by males, are found distributed through Australia and Papua New Guinea.

30. His revised modes are ovuliparity, with external fertilisation;