CELLS Mitosis Interphase Metaphase Prophase nterphase division Mitotic Unpacked chromosomes spindle Plasma membrane nuckoar envelope Replicated, condensed chromosomes Sister chromatids Fragments of Nuclear envelope Chromosomos are replicated during the s phase, before mitosis begins. O The replicated chromosomes condense and attach lo the mitotic spindle, which is made up of cytoskolotal proteins. The nuclear envelope breaks dowm. e The mitotic spindle aligns the replicated chromosomes at the center of the cell at the metaphase plate. Onion root tip
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:
Q1: Do all cells in an organism enter each stage of mitosis at the same time? (Hint: See image of onion root tip at far left in the figure.) Q2: What happens between the end of interphase and early prophase that changes the appearance of the chromosomes? Q3: Explain in your own words the role of the mitotic spindle in mitosis.

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