biology help homework????

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which of the following is a pre-zygotic isolating mechanism?

F2 fitness

hybrid sterility 

zygote morality 

temporal isolation 

Aug 27th, 2015

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temporal isolation.

  • Habitat: organisms in different areas cannot mate since they dont meet.
  • Behavioural: during the selection of a possible mate, individuals from different species may discard each other as they don’t have the same mating rituals.
  • Temporal: individuals from different species may be in season at different times in the year so they won’t be interested in copulating at the same time.
  • Mechanical: different species may have different sex organs which aren’t compatible. It just won’t fit.
  • Gametic: for fertilisation to occur, the sperm must reach the ovum. For this to happen they usually attract each other through chemical means, but the chemicals might vary from one specie to another. In this case gametes won’t recognise each other and fertilization won’t take place.

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Aug 27th, 2015

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Aug 27th, 2015
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