Explain post -zygotic barriers in
Reproductive isolating mechanisms.
Answers
Postzygotic mechanisms include hybrid inviability, hybrid sterility and hybrid "breakdown.
The offspring of two mice that cannot produce viable gametes. Which is an example of a postzygotic isolating barrier? ... The hybrid offspring of two species of crocodiles that can produce normal gametes but cannot obtain a mate.
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Answer:
Pre-zygotic isolation mechanisms are the most economic in terms of the natural selection of a population, as resources are not wasted on the production of a descendant that is weak, non-viable or sterile. These mechanisms include physiological or systemic barriers to fertilization.
The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation.