Polyploid organisms of a normally diploid species are often sterile because: tetraploids are not sterile some of the chromosomes cannot synapse during mitosis none of the chromosomes can synapse during meiosis all the homologous chromosomes attempt to synapse together during meiosis

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Oogenesis

The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase. 

Cell Division

Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons: