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Which of the following statements describes mechanical isolation prezygotic barrier? Prezygotic reproductive isolation is a mechanism of reproductive isolation that prevents the fertilization of the eggs. Summary: Prezygotic and Postzygotic Mechanisms of Speciation Prezygotic Mechanism Description Example Behavioural Isolation (prevent mating) Different species use different courtship and other mating clues to find and attract a mate. What is Prezygotic Isolation? Prezygotic RIMs prevent the formation of hybrids between members of different populations through ecological, temporal, ethological (behavioral), mechanical, and gametic isolation. • Prezygotic barriers: Anything that prevents mating and fertilization is a prezygotic mechanism. If mating does occur, postzygotic barriers reduce the chances that an offspring will survive before being born.One prezygotic reproductive barrier is mechanical isolation. Speciation in parasites has not received the same attention as speciation in non-parasitic species, despite the fact that parasites are more abundant than non-parasites [ 18 , 19 ]. • Prezygotic barriers: Anything that prevents mating and fertilization is a prezygotic mechanism. The prezygotic isolation mechanism in living organisms prevents the fertilization of the zygote when a cross between two different species belonging to the same genus occurs. Moreover, habitat isolation, behavioral isolation, mechanical isolation, and gametic isolation are the mechanisms of prezygotic isolation. A) two species live in different habitats. The prezygotic isolation mechanisms observed are mechanical isolation, temporal isolation, behavioral isolation, habitat isolation, and gametic isolation. Some Furthermore, prezygotic isolation evolves faster than postzygotic isolation and prezygotic isolation is higher in sympatric than allopatric species pairs. There are two types: prezygotic and postzygotic. Habitat isolation, behavioral isolation, temporal isolation, mechanical isolation and gametic isolation are all examples of prezygotic isolating mechanisms. Mechanical isolation is not just restricted to animals, but is also seen in plants. D) two snails have shells that spiral in different directions Habitat isolation, behavioral isolation, temporal isolation, mechanical isolation and gametic isolation are all examples of prezygotic isolating mechanisms. Such barriers that occur before the interbreeding are called the prezygotic mechanism of reproductive isolation. Reproductive isolation: the existence of biological factors that impede members of two species from mating. Postzygotic barriers: often prevent the hybrid zygote from developing into a viable, fertile adult Prezygotic barriers: impede mating between species or hinder fertilization of ova if members of different species attempt to mate. Reproductive isolation is a biological process or a biological barrier that prevents two sexually reproducing species from breeding and forming a fertile or a completely different species. Furthermore, prezygotic isolation plays a key role in the natural selection of a population, while postzygotic isolation prevents successful inter-population crossing. There are different categories of prezygotic isolation mechanism. …categories of reproductive isolating mechanisms: prezygotic, or those that take effect before fertilization, and postzygotic, those that take effect afterward. Some B) two species mate at different times. C) two species share courtship activities. They are behavioural isolation, habitat isolation, mating seasons, mechanical isolation, temporal isolation, gamete isolation, etc. In fact, a textbook example of mechanical isolation in plants will be that of the two sage species, the black sage and white sage. Prezygotic barriers prevent mating from even happening. 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