D Question 12 Anaphase involves the: Re-forming the nuclear envelope de-compaction of chromosomes, and spindle disappears. O Aligning of the chromatids along the midline of the cell Ⓒ Compaction of chromosomes, positioning of the centrosomes, and spindle formation begins O Nuclear envelope breakdown and spindle completion Segregation of sister chromatids D Question 13 Prophase involves the: Nuclear envelope breakdown and spindle completion Aligning of the chromatids along the midline of the cell Re-forming the nuclear envelope, de-compaction of chromosomes, and spindle disappears O Segregation of sister chromatid Compaction of chromosomes, positioning of the centrosomes, and spindle formation begins

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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: