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In human fertilization, two 1n haploid cellsâan ovum (female gamete) and a sperm cell (male gamete)âcombine to form a single 2n diploid cell called the zygote.n fungi, the sexual fusion of haploid cells is called karyogamy. The result of karyogamy is a diploid cell called a zygote or zygospore. This cell may then enter meiosis or mitosis depending on the life cycle of the species.
In summary, a postzygotic reproductive barrier is a mechanism that reduces the viability or reproductive capacity of hybrid offspring. Hybrid zygote abnormality is a type of postzygotic barrier in which hybrid zygotes fail to mature normally.Hybrid infertility is a type of postzygotic barrier in which hybrids are incapable of producing offspring.Low hybrid viability is a type of postzygotic barrier in which the viability of hybrid offspring is lower than offspring in either population.ostzygotic reproductive barriers occur after the zygote has formed, meaning they either reduce the viability (which basically means the ability to avoid dying) or the reproductive capacity of the hybrid offspring.