What types of repoductive isolation prevent the formation of a zygote?

I-Mechanical Isolation


II-Hybrid Infertility


III-Temporal Isolation


IV-Hybrid Viability


V-Gametic Isolation


VI-Isolation by Habitat


VII-Behavioral Isolation


VIII-Hybrid Breakdown











II, IV, and VIII





I, III, V, VI, VII





I, II, IV, V, VII





II, III, IV, VI, VIIIWhat types of repoductive isolation prevent the formation of a zygote?
These are the ones...........


1. Habitat Isolation. Two species may live in the same area but in different habitats. Living in these different habitats ( in water, living on land, or living in tree tops) effectively segregate these organisms from each other. Since there is little if any contact the possibility of successfully mating is drastically reduced.





2. Temporal Isolation. Two species that breed at different times of the day, season, or year cannot mix their gametes. Since the breeding times are different there is no chance of reproductive contact.





3. Behavioral Isolation. Species-specific signals and elaborate behavioral patterns are used by closely related species to insure contact with the proper mate. Birds, mammals, and insects have pre-mating rituals that attract the proper mate. These signals can be chemical or physical in nature. Other organisms pay little or no attention to these behaviors or scents.





4. Mechanical Isolation. Anatomical incompatibility may prevent sperm transfer between two closely related species. The absence of certain appendages or their modification may inhibit a male from grasping and successfully fertilizing the female. Difference in floral structure may prevent pollen from reaching the stigma of the intended flower.





5. Gametic Isolation. If for some reason foreign sperm is introduced into a female there are several preventative measures to insure that there is no union between the sperm and egg. Internal environmental conditions may cause the sperm to die. Gamete recognition sites on the sperm do not fit with the intended egg. If the two species differ in the type of fertilization (external and internal) there is no chance of the sperm ever contacting the egg.What types of repoductive isolation prevent the formation of a zygote?
i would say check your textbook