The photomicrograph below shows mitotically dividing cells from whitefish (Coregonus lavaretus). What stage of nuclear division is not observed in the photomicrograph? A group of naturally occurring diploids of this species has 40 pairs Cell 1 of chromosomes. b.1. Considering the stage shown in Cell 1, how many centromeres would you expect? b.2. What is the chromosome number of the species by the end of the stage shown in Cell 3? b.3 How many chromatids should there be at the stage shown in Cell 2 Cell 3 Cell 2? C. lavaretus (Magnification:400x)

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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: