Fertilization restores:

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(B) During gametogenesis,the process of meiosis reduces the chromosome number to half,resulting in haploid $(n)$ gametes (sperm and ovum). Fertilizati

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Diploidy from haploidy

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(B) During gametogenesis,the process of meiosis reduces the chromosome number to half,resulting in haploid $(n)$ gametes (sperm and ovum). Fertilization is the fusion of a haploid male gamete $(n)$ and a haploid female gamete $(n)$. This fusion results in the formation of a diploid $(2n)$ zygote. Thus,fertilization restores the diploid condition from the haploid state.

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