Maturation promoting factor, MPF, is a cyclin-CDK complex that catalyzes the phosphorylation of other proteins to start mitosis. The activity level of MPF is dependent on the relative concentrations of the cyclin and CDK components of MPF (Figure 1).   Based on Figure 1, which of the following describes the role of cyclin in the regulation of the cell cycle?   a.During S phase, the cyclin level remains the same because DNA replication is occurring.   b.During G2 phase, the cyclin level remains low, causing MPF activity to decrease, which leads cells to initiate mitosis.   c.During G1 phase, the cyclin level decreases to signal the start of the resting phase of the cell cycle.   d.During M phase, the cyclin level peaks, resulting in an increased binding frequency with CDK.

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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: