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:
A cell is defined as the smallest unit of a living organism which is the basic structural, functional, and biological unit of organisms. These are known as building blocks of life which are made of proteins, lipids, nucleic acids, and carbohydrates. These cells are unicellular or multicellular and the study of cells is called cell biology, cellular biology, or cytology. The cell was discovered by Robert Hooke in 1665.
An animal cell is a eukaryotic cell that is smaller than a plant cell. An animal cell does not contain a cell wall but it consists of a true, membrane-bound nucleus that is present at the center of the cell along with the other cell organelles. DNA is present inside the nucleus. The size of animal cells ranges from a few microscopic microns to few millimeters. Due to the absence of a cell wall, its shape is irregular or it may exist in different shapes such as flat, others oval, rod-shaped, curved, spherical, concave, and rectangular.
Ex: Ostrich egg
Different types of animal cells are skin cells (Melanocytes), blood cells (RBC, WBC, Platelets), nerve cells (Schwann cells), muscle cells (myocyte, cardiac cell), fat cells (adipocytes).
Structure of an animal cell:
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